[SOLVED]How can I make the background around my character transperant?

Im drew my main player, and saved it. But it shows my player with the white block background behind it. How can I make it so the white block background is not seen around my player?

When you add an image you can select what color should be transparent, for example...

If your background is White you can select the white to be transparent in StencyWorks.

Thanxs a lot, that helped me.