i have not used paintshop pro for a while, since i use photoshop 7 alot more, but i will try ;/
1. get the pic, lets just use the gohan pic as an exmple
2. since its got a white background, and no white on the person itsself, apart from his pants, but they have a blackout line, u can just use the lasso to get the part of the pic u want
3. once its selected, go to edit>copy
4. go to your blank pic (the sig your makeing) and click edit>paste
5. use the magic wand to select all the white on the pic u have just pasted onto your sig
6. press delete then it will get rid of the white bg it has
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I think thats how to do it in paintshop, thats how i do it in photoshop anyways.