To roleplay, all you really need to do is describe and be original. By that, I mean you have to describe your characters actions, emotions, appearance, and his/her surroundings.
When doing so, that does not mean you have to type a novel sized post, as Bella believes. Its quality, not quantity. :3
BUT! no1 wnts 2 try and trnslate a bunch of txt tlk.
Translation::
BUT! you must spell, no one wants to try and translate a bunch of text talk.