If you click 'Edit' and nothing happens, you have a JavaScript error.
First, check to see if your cache folder (/var/www/dekiwiki/skins/common/cache) is writeable by your web server user or group (www-data on the VM).
Failing that, try connecting to http://{yoursite}/skins/common/js.php?perms=LOGIN,BROWSE,READ,SUBSCRIBE,UPDATE,CREATE,DELETE,CHANGEPERMISSIONS,CONTROLPANEL,ADMIN. This should return you some JavaScript code, something like this:
/* yahoo-dom-event.js (31,100), animation.js (13,670), connection.js (14,349), element.js (8,544), dragdrop.js (22,595), json.js (2,735), (etc)
If it fails, it will report the errors at the top, which you can then find and fix on your server.