Removing plastic covers around radio

Good Day,
I am installing a new in-dash receiver and I need to tuck-in the cables but I can’t do that from the opening. So I need to remove the plastic covers around the receiver, so I can pull the cables from the sides.
How do I remove the plastic covers around the receiver opening?
Thanks

Ford Escort 1993 LX

Edited:
I found another way of tuck-in the wires.
Thanks

Ok, well, first, thats not how you need to do it, just remove 1 cover from under the Radio mount, and you should see the wires and minipulate them properly, its very simple really...hope this helps xD