The installation kit+guide comes with a bunch of different screws and fasteners you can use based on your wall type. There were some thicker/stronger screws included for rock and concrete walls too! You just have to make sure you're looking at the right page of the manual to properly install it.
It shows in the directions you have to pull the little spring things in the back and the tv lifts right off of the mount and then you can put another one on there the same way you put the previous one on.
To remove the TV from the wall mount: Pull the latches down to unlock the TV from the wall mount, then pull the bottom of the TV out from the wall and lift it up and off the wall plate.