No choice, right?
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Role playing in general is when you play along with some set circumstances(these may change however) and act as yourself in this scenario or someone else.
As you can't actually do what you would on the net as you do it in reality, you usually write it out as an action. For example, when yawning, irl we would have seen you do so, but in role play you can write it out like this: *yawns*.
That's all I can tell you, someone else can probably explain battle rp better~
edit: forgot about this, but you can also read threads which explains all this, just browse the forum~ (I don't know where they are, sorry O_O)