Hi Deborah! Welcome to Splitcoast!
I think Crafters of Faith is a swap group, right? So, to join the swap forum, which will allow you to post on swap threads, start over on the left hand side of this site, where there are a couple of boxes, one of which says "around the site." There's a link in there called "Join a group." You can read more about that
here. Specifically, there's certain info you need to add to your SCS profile and an application to complete.
Note that applications to join are only processed Monday through Friday. Also, I don't think that you get notification once you're approved. You can check back at the "join a group" link (because once you're in, I think the swap group will move down show you're in it, rather than showing as available to join), or you can just try to post in the swap forum.
There is an ATC sub-group in the swap forum, but that isn't my jam, so I don't know much more about them than that!
Happy crafting!