You have too really squeeze the two fingers together, maybe even with pliers, to get the things close enough for the finger to release from them. Then try and push the finger downwards and off from the top side.
That annoyed me too as mine were almost impossible to get loose too. Once off, I took a file too all of those lock tabs and filed them down making it so they unsnap much easier. Seems someone at DJI never tried to unsnap them in the final design.