You can adjust the color in the web app (bbb.pulsar.gg), in the LED tab, LED COLOR PROFILE section. Select the profile you want, and then in the color section select the color you want to apply.

In this example, I selected Blue for profile 1 (Fn+1 to switch to profile 1), Green for profile 2 (Fn+2 to switch to profile 2) and red for profile 3 (Fn+3 to switch to profile 3)