I suppose you did a search already. Right? The search I did was with the “advanced search” page (link at the bottom of the drop down search menu at the top of every page). I limited the search to “titles only” by using the menu below the search term box on the left. My search term was “fowfer.” I got about 25 threads. Not all of them will be what you’re looking for, but there aren’t that many and you should be able to pick out the interesting ones by their title.
I also assume you found this link stuck to the top of the Newbie Forum:
START HERE ——-> NEWBIE ROUTINE <——- Important Newbie Threads/Info
On that page is a link to this: A Quickstart Guide to Manual Exercises
On that one is a description of the Fowfer and a link to Fow1’s original post about it.
Your comfort level with this technique will vary depending on how loose your scrotum is. Some guys have to pull everything to the side and put the penis under their leg. Others are able to go between the testicles and pull the penis all the way back to their anus.
If you’re circumcised the glans can take an imprint from whatever you’re sitting on. I once did this with a terrycloth towel and for a short time afterward my glans had little impressions from the loops of thread after I released it. Sitting on something smooth might make things a bit more comfortable. Be sure to check your circulation and don’t sit on it for more than about 15 minutes without a break.