i needs help!

ok, im not very bright and i need sum1 to explain how to customize my profile and stuff

There should be a button at the top of any page on the site that says 'profile.' Click it. It has a Mewtwo next to it, you can't miss it.

That would be your signature. First, you would go to 'signature' in your profile, and set it up to whatever picture you wanted to show; said picture would have to adhere to site rules.

Second, you'd have to go to 'preferences' and enable your signature to be attached to every post.

The means to put a picture in your signature is some BBcode nonsense that I cannot for the life of me understand or explain.