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how do I regas my integrated fridge freezer?

The temperature in my integrated fridge is not cold enough, I have adjusted the temperature but it makes no difference. How can I regas it.?
The fridge was in when bought the house 6 years ago and is A German make (I think). \ The only information I can give for the model is
CB 18M/1C 70/30 - 18M 50/50 - 16M
Mrs Joan Shaw, July 2014