How do I enter code into my blaupunkt...

Question

A Blaupunkt-Werke GMBH radio/cassette was previously installed into a vehicle I recently purchased. I have managed to get the code off the local Nissan dealer - but do not know how to enter it. The r/s players model number is : BP6345V4002580. It has a NISSAN front with a stylised infinity symbol and "R.D.S". Location: NSW Australia.