not coolong frig

my frig and frezer is not cool to the right temp even on the lowest setting can anyone tell me what is wrong and what i need to do to fix this promblem:confused:

Can you see any frost on the rear panel in the freezer?

Do the fan inside the freezer, the compressor and the fan next to the compressor work?

The model number you posted is incomplete. Verify and repost it, please.

Gene.