Navigate to your Brand theme page and scroll down to the Color palette section
Set your Team colors. Insert in hex values or click the swatches to select a color with the selector:
Changing these colors will only affect which colors are available going forward and won’t change existing slides.
If you want to manually change the colors within your decks, you can do so by clicking the drop icon when editing a slide.
If you want to learn more about coloring your slides, take a look at this How to use Auto Color article. With Paste's Auto Color feature you can add a background color that matches the media in your slide.