You can change your background color either by setting a plain color or changing the color of your existing background. This article covers both ways.
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To set your background to a plain color: in your image Background layer, pick a color from the color palette or set a custom color using RGB/Hex value (cf. video below).
Note: a color picker is available on mobile, coming soon on the web. A color picker allows you to pick a specific color directly from your image
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To modify the color of your existing background: use "Original image" template to restore your original background, then in your image Background layer click on "Adjust" and modify Hue, Saturation or Temperature color. (cf. video below).
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If you need more information, let us know!
Have a great day!