How do I remove back panel inside of freezer on lg lrfc25750?

Once you have the racks etc out, you should see some round plastic plugs which hide the mounting screws, carefully use the point of a knife to pick these out. The screws for the back panel are then visible. Once they are out, the back panel is also held in with clips which are part of the back panel. Start at one of the top corners and carefully ease the panel out and away from the back of the freezer. If your model has the fan motor attached to the back panel, there will be a wiring plug you will need to undo to fully remove the rear panel.