Change Background color on custom collage
Adobe Photoshop Elements 2020. New, don't have time to do any lessons, as this is a rush job for a client gift. Made a custom collage, I finally arranged all of my photos leaving even spaces around each, which wasn't easy. I also have text across the top. I cannot get the background color to change. It is white. I want the page to be black (background). Please walk me though this, I feel like I've tried everything. The paint bucket fills in, but ruins the photos that have anything white on the edges. What I see on the screen is white and grey checkerboard. I don't know anything about layers either 😞 HELP! Thank you in advance.

