How to remove freezer frost?
Remove all the food, then turn off or unplug the freezer, and prop the door open. This will allow it to warm up and all the ice will melt all by itself.
Every modern fridge/freezer I've ever seen (modern as in 1970s or newer) has a drain hole at the bottom of the compartment and a hose that runs to the drip pan that's behind the trim plate at the bottom of the fridge. Generally a good tug will remove the trim plate, though if yours doesn't come off easily you may want to look for screws.
Remove the trim plate and you'll see the drip pan under there for catching any drips that go down the drains in either compartment. Keep an eye on this catch pan to ensure it doesn't overflow. Soak the water out with some towels that you can ring out over the tub, or scoop it out with a small cup if there's enough room. It's possible that the water will evaporate out nearly as fast as it melts in if your room is warm enough.
Once all the ice is melted out, plug in/turn on the unit, let it get cold, put the food back in.