diff --git a/amanuensis/server/home.py b/amanuensis/server/home.py
index 027803e..326dba1 100644
--- a/amanuensis/server/home.py
+++ b/amanuensis/server/home.py
@@ -1,7 +1,7 @@
 from functools import wraps
 import json
 
-from flask import Blueprint, render_template, url_for, redirect
+from flask import Blueprint, render_template, url_for, redirect, flash
 from flask_login import login_required, current_user
 from flask_wtf import FlaskForm
 from wtforms import TextAreaField, SubmitField, StringField
@@ -20,6 +20,7 @@ def admin_required(route):
 	@wraps(route)
 	def admin_route(*args, **kwargs):
 		if not current_user.is_admin:
+			flash("Access is forbidden")
 			return redirect(url_for('home.home'))
 		return route(*args, **kwargs)
 	return admin_route
diff --git a/amanuensis/server/lexicon.py b/amanuensis/server/lexicon.py
index c6f9a4b..12c7b1e 100644
--- a/amanuensis/server/lexicon.py
+++ b/amanuensis/server/lexicon.py
@@ -1,15 +1,21 @@
 import json
 
-from flask import Blueprint, render_template, url_for, redirect
+from flask import Blueprint, render_template, url_for, redirect, g, flash
 from flask_login import login_required, current_user
-# from flask_wtf import FlaskForm
-# from wtforms import TextAreaField, SubmitField, StringField
+from flask_wtf import FlaskForm
+from wtforms import TextAreaField, SubmitField
 
 import config
+from config.loader import ReadOnlyOrderedDict
 import user
 import lexicon
 
 
+class LexiconConfigForm(FlaskForm):
+	configText = TextAreaField("Config file")
+	submit = SubmitField("Submit")
+
+
 def get_bp():
 	"""Create a blueprint for lexicon pages"""
 	bp = Blueprint('lexicon', __name__, url_prefix='/lexicon/<name>')
@@ -32,6 +38,39 @@ def get_bp():
 		lex = lexicon.LexiconModel.by(name=name)
 		return render_template('lexicon/session.html', lexicon=lex)
 
+	@bp.route('/session/edit/', methods=['GET', 'POST'])
+	@login_required
+	def session_edit(name):
+		# Restrict to editor
+		lex = lexicon.LexiconModel.by(name=name)
+		if not current_user.id == lex.editor:
+			flash("Access is forbidden")
+			return redirect(url_for('lexicon.session', name=name))
+
+		form = LexiconConfigForm()
+
+		# Load the config for the lexicon on load
+		if not form.is_submitted():
+			with config.json_ro(lex.config_path) as cfg:
+				form.configText.data = json.dumps(cfg, indent=2)
+			return render_template("lexicon/session_edit.html", lexicon=lex, form=form)
+
+		if form.validate():
+			# Check input is valid json
+			try:
+				cfg = json.loads(form.configText.data, object_pairs_hook=ReadOnlyOrderedDict)
+			except:
+				flash("Invalid JSON")
+				return render_template("lexicon/session_edit.html", lexicon=lex, form=form)
+			# Check input has all the required fields
+			# TODO
+			# Write the new config
+			with config.open_ex(lex.config_path, mode='w') as f:
+				json.dump(cfg, f, indent='\t')
+				flash("Config updated")
+
+		return render_template("lexicon/session_edit.html", lexicon=lex, form=form)
+
 	@bp.route('/statistics/', methods=['GET'])
 	@login_required
 	def stats(name):
diff --git a/amanuensis/templates/lexicon/session.html b/amanuensis/templates/lexicon/session.html
index a851065..e60ed53 100644
--- a/amanuensis/templates/lexicon/session.html
+++ b/amanuensis/templates/lexicon/session.html
@@ -2,10 +2,13 @@
 {% block title %}Session | {{ lexicon_title }}{% endblock %}
 
 {% block main %}
-
 <h1>Session</h1>
-
-{% set lexicons = current_user.lexicons_in() %}
-
 {% endblock %}
-{% set template_content_blocks = [self.main()] %}
\ No newline at end of file
+{% set template_content_blocks = [self.main()] %}
+
+{% if current_user.id == lexicon.editor %}
+{% block editor_edit %}
+<a href="{{ url_for('lexicon.session_edit', name=lexicon.name) }}" style="display:block; text-align:center;">Edit lexicon settings</a>
+{% endblock %}
+{% set template_content_blocks = [self.editor_edit()] + template_content_blocks %}
+{% endif %}
\ No newline at end of file
diff --git a/amanuensis/templates/lexicon/session_edit.html b/amanuensis/templates/lexicon/session_edit.html
new file mode 100644
index 0000000..f8c6407
--- /dev/null
+++ b/amanuensis/templates/lexicon/session_edit.html
@@ -0,0 +1,14 @@
+{% extends "lexicon/lexicon.html" %}
+{% block title %}Edit | {{ lexicon_title }}{% endblock %}
+
+{% block main %}
+<form action="" method="post" novalidate>
+	{{ form.hidden_tag() }}
+	<p>{{ form.configText.label }}<br>{{ form.configText(rows=20) }}</p>
+	<p>{{ form.submit() }}</p>
+</form>
+{% for message in get_flashed_messages() %}
+<span style="color: #ff0000">{{ message }}</span><br>
+{% endfor %}
+{% endblock %}
+{% set template_content_blocks = [self.main()] %}
\ No newline at end of file