How can I change the "Welcome Name," text?

Andrew,
First, you'll be getting an email right after this about your subscription expiring. That's because I'll be merging your two JFBConnect subscriptions into one longer one. You have 2 because one was the migrated JLinked subscription. They should have been automatically combined and extended already, but it seems like that didn't work right for you. Your new unified subscription won't expire until March, 2015.

As for your original question, the "Welcome xyz" text is in the /language/en_GB/en_gb.mod_sclogin.ini file. The specific string is:

MOD_SCLOGIN_WELCOME="Welcome %s,"

You can also use the Joomla -> Language Manager to create an override of that key, which will make the change persist even when you upgrade the module.

I hope that helps, but if you have any other questions (including about the avatar, which I'm not sure what's wrong there), just let me know.

Thanks,
Alex