Either the tutorial was in a diff program or im retarded. Both strong possibilities but what i am trying to do is put a picture of the demon hunter on another background but the picture i have is the demon hunter over a white background and i cant make the white go away.
Any help? here is the picture
http://www.diabloiiikore.com/photos/Diablo-3---Demon-Hunter/demon_hunter_diablo_3___talia_by_shikamaru_no_kage-d31op84.jpg

You do this in photoshop
Take a look at this tutorial: http://forums.d2jsp.org/topic.php?t=4379618&f=246

Here is the rendered picture:

Here is a tutorial that claims to show how to do it in paint.
http://redrum-love.deviantart.com/art/MS-Paint-Transparency-Tutorial-132487892

If it doesn't work, use a free program like GIMP or buy Photoshop.