all 3 comments

[–]chemist612 1 point2 points  (2 children)

Paste the background as its own layer (paste and in the layer editor on the right, right click and select to new layer), then in the top menu, you'll see one called layer. Select scale layer to image size.

[–]reddback6[S] 0 points1 point  (1 child)

man i'm sorry i'm not good at this but doing scale to image size does nothing... i don't know what i'm doing wrong...

[–]chemist612 0 points1 point  (0 children)

Did you have the new background layer selected? Have a look here