Ok, I managed to make the change I wanted by changing the
phrase name="vbjournal_at" to say 'on' rather than 'at' in the product xml.
I still have the problem that a Registered Member cannot edit their own articles. I have the permissions set correctly in the Usergroup Manager, but when the Edit button is clicked it says "You don't have permission to......".
Mary, on your working demos, does the vbulletin editor have a preview button? Because mine doesn't. I'm also baffled by the fact the editor works perfectly but there is no img button. It appears on the vbulletin editor within the rest of the forum!
If anyone wants to have a look at how I have vbjournal set up then it's here:
http://www.labellavocedellapuglia.com