How do I Activate the drone

I recently downloaded the Litchi App. for my DJI Mini 2. It appears to have synched up to the drone (the camera works) but it will not fly with a message saying “activate the drone”. I’m sure I missed a step in set up however how do I activate the drone at this point?

The DJI Fly app must still be used for a number of functions including activating your drone.

See this post by @TriBar :