Hi, welcome to the WOFMB! I'm Shi :3
WOFMB= Wings of Fire Message board
FWRP= Forum-wide roleplay
ML= Miraculous Ladybug (a FWRP based on the show)
GGaD= Gods, Goddesses, and Deities (a FWRP based on mythology and stuff)
GvE= Good verses Evil (a FWRP about flipsides and such)
Roleplays are usually only specific to one thread but FWRPS are spread out in a bunch of different posts. To join a FWRP, you'll have to somehow find the sign-up form (they can be hard to find sometimes when they get buried by all of the other posts) and fill it out with your character(s).
Hope that helps :)