Adjusting the Text Color
Auto-Branding Colors - These are the colors that are setup under your account settings.
Hex - Add any color by adding the Hex code.
Preset Colors - Additional predefined colors.
You also have the option to use the color picker.
Changing the Color for Backgrounds, Canvas, Headings, Footer, Links, and Buttons
Email Backgrounds
Click on the Settings Icon then scroll to Email BG to change the color.
Change Background Color by Section
Click on the section you would like to change the background color for.
Select a color under Section Background.