Could someone, please, please help me on this?

After this, I promise to stop asking all sorts of stupid questions.

I registered for a free sip account on this site.
https://simonics.com/gvgw/

The only good instructions on how to use a SIP account on the tablet I got from this thread.
http://talk.maemo.org/showthread.php?t=30349

His link is now dead.

I seriously have no clue how to set any of this up so that I can finally go back to making and receiving free phone calls after Gizmo died.

Pwease?