Really, just go to the December quit group, go to the last page, and say "Hi, I'm on day 1, how do I post roll?"
They will point to the steps :
find last roll post
hit the quote button
select all (ctrl A)
cut (ctrl X) [this is the tricky step, don't copy]
go to the upper box on the form, paste (ctrl V)
find the list of bad ass quitters (it is above the supporters, you will need to scroll) add you name and days, plus whatever short comment is on your mind
hit post.
That will become automatic in time. Right now the only way to screw up roll is to not post at all (even a "somebody post for me" reply works)