It is quite simple to remove your Dacia radio. You will need a set of radio release keys. These are inexpensive and are around £2 - £4, you can obtain them from a local car audio shop or Halfords.
Once you have the radio release keys, push them into the 4 holes in each corner of the radio (See image), apply a little pressure and the radio will release from the dashboard. The radios label will be located on the radio's casing.
The Dacia radio serial is a letter followed by 3 digits for example F949. This is sometimes within a contained box with "Security" or "Security code", This may also be part of a larger serial/barcode number starting with 8200/7700/2811. An example of this would be 281155216RTV212.