A signature is text or images or both that a member will have show up underneath very post they make. To create a signature, you need to first decide what you are going to use and find out if you have permission to use it. Then go to your name at the top right and hover over it, then click on signature. This will take you to the box where you can add in a signature. It's advised to click preview before save to make sure you have it the way you want it first. Then click save.