Posting your idea:
* Create a new topic in the forum (open RPG's) and title it appropriately
* Your first post should explain/detail you idea for the rpg. Write an introduction to it, explaining who what when where why etc so people know what its about and how they would fit in.
WHEN YOU HAVE GOTTEN ENOUGH PLAYERS FOR YOUR GAME AND DONT WISH TO ACCEPT ANYMORE PLEASE EDIT THE TITLE OF THE TOPIC AND ADD (CLOSED) TO IT. i will then delete it after a short time to avoid forum clutter.
Replying to an idea:
Found an rpg idea that you like and want to join? than all you have to do is reply to the topic and say so. Ensure you ask any questions you have for the creator and give a link to your character's profile