Double-click on any Theme to Edit and change it

All the COLORS can de changed using the relevant button - it will open up for you a PRE FILLED 32 bits color selector
You can also copy paste the colors between entry fields
If you want to use an image as main frame background, then use the appropriate button to select one (keep in mind the Drag & Drop "information line" font color cannot be changed)
You can even define the gradient colors of the top frame toolbar and navigation panel
You can also define the color (background) to be used in all DMC buttons

When all changes are done simply use the "Save" button to revert to the main screen where you can use the "Apply" button to see all changes IMMEDIATELY applied throughout DMC.