Oh~
Well u have to render the picture u want first or u just get a render from someones else~
U put that render in the sig in the position u want
Then u copy the render and have 2 of them~ u make 1 of Then bigger~ to make it almost transparent u have to click on that list on the side where all the pics are and can chose how bright u want it to be~
Sowwy im bad at explaining >.<
I would show u a Video as example but cant use YouTube here>.<