How do u make a anime sig i think its called a anime signature or something and its under forum posts?

so how do u make one i dont wana make a cheap one like make it from a wallpaper done by someone else and just changed the size from it i wanna make a good one like a byakuya one with a cool preety backround that no one made yet if u dunno wat im talking bout heres a site for an example
heres a site of a forum that when u scroll down ull see pics under their posts–> http://forum.cartoon-world.org/viewtopic.php?t=186 also that site lets u download bleach english episodes 1-41

PHOTOSHOP

Best Anime Wallpapers