my first sig

My first sig with Ps cs3 theres just one problem that i didnt know how to delete that white from screen. plz help me with it otherwise sig isnt bad for first or is it?

 

is without the white space, i just prnt screened it, open it in paint and selected the sig, or you can do it in ps.. you go to image > canvas size and use the arrow things but its confusing so yea paint is easier