This is an old topic but I thought I’d post the solution since I was looking for the answer to this.
In a network site (multi-site) the editor is located on the Network dashboard (Appearance > Editor).
The clue was you said “multisite installation” 😉 Thanks! 😛
Hmm, I had the trouble of not being able to log out. I use pretty permalinks, so the login page is http://www.site.com/login. The link generated to log out someone was like http://www.site.com/login?action=logout. When clicked all it does is show the user’s profile.
I’m using WordPress 3.4 and I did check for compatibility issues with other plugins. I’m simply not going to use the plugin because of this. I thought this would be a great plugin otherwise, so I decided to let you know the problem.
If you fix it I may switch back and try this plugin again.