So you have your picture/image and you want to attach it into your signature on this board.
Copy the img code from the site where your image is being stored. When on this board click on the profile icon
at the top of the board underneath your username. Then click on Forum Profile Information which will be in the left hand side box. Then scroll down the page and you will see signature: next to this will be a box, this is where you paste your img code. You get a max of 300 characters. The img code will stay as a code in your profile but the picture/image will show up in your signature after you have submitted your posts.