My refrigerator is not getting cold. Do i n...

My fridge is not geting cold but my freezer is perfectly cold..We have to put our food from the fridge in our freezer just so it will stay fresh. We were wondering if it need freeon and if we could but it ourselves or do we have to have a specialist come fix it. We also have a atove of the same model and it also has went out. Dont know y but we really need some advice on what to do...Thanks