In the upper right of this forum is the outline of a person. Click this and then edit profile. In the profile, there are a series of tabs across the top. One is Signature.<
Not for me for some reason. The steps you have listed are correct but you have to click "EDIT" on one of the categories to get Signature to show up at the top in the menu bar.
Never mind. I was clicking on my name next to the "grayling".