1. Click on the initial background icon in the middle of the canvas to add a background
1. Click on the “edit background” icon located at the bottom of the canvas
2. Click on the “Pick a Color” option located on the left hand side
3. Click on your color of choice
4. Click on the desired background and click the “Apply to this” button (applies to that one slide) or “Apply to all” button (applies to all of the slides in that particular buncee).