Thanks for the link, and no problem for the support.. it's what we do
The module that's doing the popup thingy looks to be in the "top-panel" module position and may be called "ja-headtools". Can't be certain, but you basically need to find the JA Login module (which hopefully the information in the last sentence will help you find). Once done, simply look in the tmpl folder of that module and modify (or create a template override as described above) and add the {JFBCLogin} tag in that pop up area.
Hopefully, it's simple, but if not, you'd definitely need to talk to them.. but support from other devs isn't always super fast, so thought we'd try again.. this is about as far as I could probably take you though on this request.
Should you need anything else though, just let us know!
Thanks,
Alex