Well you seem to be logged in fine now. Otherwise you would not have been able to post here. Password & username is your responsibility after registering here. However you would be able to retrieve either if you remember one of them at least.

Here's a starting point: Major Topics for Getting Started Using LimeWire 4 or 5 Hope it helps

The GMail option in LimeWire has nothing whatsoever to do with these forums. That option is something else. Personally I do not know how it works, I haven't tried adding friends to it yet. That option is for sharing a range of files only between friends & being able to connect directly to them.