Can someone please explain Roleplay sites to me?

Basically what 你 do in a roleplay is 你 create 或者 claim a character and 你 portray him/her. 你 have conversations with other characters, etc. At least that's how most roleplays go...
i recently just started my own 邪恶力量 roleplay if you're interested in joining, we'd be happy to have 你 :)
www.supernaturalroleplay.piczo.com
yeah i checked out the site 你 signed up for and it seemed pretty confusing..
but mine is a LOT simpler to follow in case you're wondering :)