To find certain character bios you'd have to go the
Character Depository within Out-of-Character > Character Depository.
And as for the Posting Process?
If you mean setting up for one, you first find an Interest Check which is where people are looking for people to join their RPs. You can find those in the
Bulletin Board within:
Out-of-Character > Bulletin Board
Then when that's done usually the GM (Game Master) of the RP will set up an
OOC (Out of character) forum and link to it. Which is where players discuss the RP and plan about it. You can find those within:
Out-of-Character > Out-of-Character Discussion
And then once everything is properly planned? Your GM will set up an
In Character thread where the actual RP takes place, and likewise will usually link to it. Which you can find within:
Play-by-post > Select your Genre
If however you mean the workings of an RP itself? Basically it's you and another player writing a book, except instead of just going on and on by yourself you each control different characters, and you take turns respond to one another. So in an RP with just two players you'd make a post, they would make a post replying, and then you'd reply to them etc. If it's a Group RP it differs by group, but usually you either just wait for one other person to post OR wait for every player in the RP to post before replying.
Does that help?