The cover to the electrical cord came off. Any idea how to put it back on?

Wasn’t sure where to post this, if anyone has a better sub please feel free to tell me. This is a Fleetwood Cheyenne pop up, about 12yrs old (got it from father in law when they upgraded). Don’t know how it came off, I found it on the ground this morning, I’m thinking when someone moves the garbage cans they clipped it, but oh well. It’s not broken, but I have no idea how to put this back on. There’s no way for it to go in from the back, like if I took the plate off, and there’s no way to simply pop it in from the front. Obviously there’s a way since they did it when it was built, but this is beyond my brains capacity (I feel dumb).

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