In the User control Panel -> Profile -> Edit Signature.
This is the place that many users put some info, it might be about there equipment they shoot, The club they belong to or even a quote that they like.
The Moderators have no issue with you doing that.You will however keep it to 2 lines of text and NO graphics
People come to the forum to read the posts not the stories attached to each post in signature blocks. Please adhere to the rules and make the Moderators job easy.