Oh, you mean your Signature? Here's what you have to do...
First, go to your User CP. It is the Link under the Betta Image at the Top Left Corner near the Title of this Site.
When you Click it, you will be taken to your Page. On the Left, there is a Listwhere there are Options you can do. You have to Click "Edit Signature". Once you click it, you can make your Signature and it Automatically shows.
Hope this Helped!!! :DDD