Step 1: From the dashboard go to the Content dropdown and select Web Campaign.


Step 2: Lock any of the colors you'd like to keep in your theme. 


Step 3: Click on Select Theme.



Step 4: Once your theme has been selected make sure the colors showing New Value were not any of the colors you locked. The colors you've locked will not show at all in the theme. 



Step 5: Save to set the theme.