i use i'm starting with a blank white sig

and i need to add my render...how do i go about doing that? when i open it...it just deletes my background layer

(i use paint.net if this matters)

Shit. Um... Open the Render file, then CNTRL + A. Now, there should be black and white lines rippling around the image / box that contains the image.

CNTRL+C to copy it

Open the sig layer

CNTRL+V

wow, was that easy...thanks man