To set up the remote's color buttons, do the following:

1. Open the Home App
2. Go to the "Smart Home" section
3. Open the settings of the remote control. To do this, press on the tile or tap on the three dots at the top right corner of the tile
4. Press on the color button which you want to set up
5. Select whether you want to program individual device actions or a scene

Devices:

1. Tap on the devices which you want to program with the color button and press "Next"
2. Tap on the individual devices and select the action to be performed. Confirm the action with "Apply"
3. Test the configuration with the button "Test action" and finally confirm it with "Done" at the upper right corner of the screen. The color button is now set up

Scenes:

1. Tap on the scenes which should be activated with the color button and press "Next". The color key is now set up

How to set up a scene can be found here.