Armrests are loose

Hello all. I just bought my 06 Aveo and I'm thoroughly enjoying it. But when I test drove it, the dealer was slick enough (Or I was dumb enough) to hold a conversation the entire time, so I didn't notice the plastic piece on the armest is kinda loose. It's not a major problem, but it does grate the nerves after a while since it rattles when I'm on the highway. Is there an easy way to tighten it back up? Preferably something that's not too complicated, as my expertise with cars is lacking at best. Thanks in advance!

there is a screw hole right in the center. Take off the plastic cover tighten and enjoy. if they are stripped, the you need an other plastic insert to go in that hole. That's more complicated and requires removing the door cover.