What you'll want to do is go into your file location where it shows the texture folders that YGOpro uses. Look in that file and you'll find the files named "cover" and "bg". replace the cover file with whatever you want and name the new file you put in "cover". Do the same for the bg file. That should work. There are also various videos covering it so if this doesn't help I'd direct you to youtube. Hope this helps. PS welcome to the forums.