Radio code for 2003 plate Ford KA?

My radio in my ford KA wont work, it says it needs a code. It is a 2003 plate. On the radio it says 6000 CD RDS E O N

The serial number is M054406

Can anyone help me with this please?!
Added (1). also, after I have typed in the code, what button do I press on the radio?

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