Go to Paltalk Website and download the paltalk software, which you need to register also (don't worry, it's free if you don't mind a few adverts).
when it's running, you need to browse the groups (making sure 'Adult' is checked) and look for 'Mudcat Song Circle'. Double click to join. Some first-time users experience audio glitches, but we'll try and sort that out on the wing.
Paltalk requires a PC running Windows 95/98/NT/XP. For Audio you'll need a soundcard with speakers/headphones, and to join in and play or sing you'll need a microphone hooked up to it as well.