AJ : Click on Quick Links on the upper line, Edit Signiture. Scroll down and you gonna see Upload custom sgniture line..Click on it...You gonna see your current sig, then just click on Browse...Then select the sig you've already saved to your computer and the rest is obvious...Then you gonna get a line a command line, click on it once then right click copy, go back, paste it into the window above the Upload Custom Singniture line...
So this is easy...If you don't get something try to figure out by yourself (I'm tryin' to help here) 😄