2005 Honda Civic "clear radio code err 3" Questions

radio reads erre. How do I clear the error message so I can input the code? I also, need instructions on entering the code. ok your radio displays ERR , OK 3 options let it sit for an hour turned on ,

...will need to first unplug radio,or disconnect battery to reset radio memory,then type in radio code.again if entered incorrectly 3x ,radio would need to be reset again too clear error codes.good