Every site has different coding.
I actually find RPG Crossing a bit overwhelming with all the formatting possibilities. My general strategy is to steal someone else's formatting. (By hitting the "quote" button on the post you like, then copying and pasting the results before editing to make them your own.)
The same general approach works on all play-by-post sites. There are many out there, but Shadowrun games are admittedly not common.
Thanks. Sounds like a good plan.