Signature Image Help!!! :)

Hi boys and girls! I need some help! As you know, writing is my game, my only game, and as a result I lack a certain amount of technical knowledge when it comes to computers and all that new fangled nonsense! Can someone help me make my signature image smaller?! I mean I know I am cute but I think that a picture the size of a semi is probably pretty annoying to readers! Help!

I've always just opened the images up in paint (on windows) and used the "resize" option. Just make sure you don't overwrite your original picture if you're making it smaller because it'll be all pixel-y if you have make it bigger again.