Toribash
Just do
this code:
[SPOILER="SPOILER TITLE"] YOUR TEXT [/SPOILER]

Theres a Button on the Post window too, second from top right
Sure, you can also close your own threads under the 'thread tools' menu in the right top corner of the thread.
Hi
Rapid Threads Lmod.
Got any questions? Feel free to ask!

[SIGPIC][/SIGPIC]