We are currently working on a 'how to' guide so it isn't up yet but if you want to:
Post Pictures ---> Upload your picture to a host. Try www.imageshack.com
, it is free! Just upload and then copy and past the URL between the tags [*img][/img*] but you have to remove the two *, I just put them there because if I don't, you wont be able to see the tags.
Post a Youtube Video ---> Between the tags [youtube*][/youtube*] (again, remove the 2 *), put the part of the video URL that follows the =. For example, http://www.youtube.com/watch?v=PU-PoUwECjI&feature=related
See the part that is green? That is the only section you need to copy and paste between the youtube tags.
I hope that is not too confusing! We hope to have that guide up soon but if you need any further help, feel free to ask me!!