2004 Honda Accord with Navigation system. Battery replaced. Entered navigation code OK, then pressed volume knob, got ERROR 1 message. I did not know until too late that I should have pressed the TUNE knob instead. Please help me to go from here to enter the code for audio/radio. I do have the code. Do I need to unhook the negative battery terminal and start over? Thank you.

I would start by disconnecting the battery again and see if it tries to sequence it again. If it doesn't work the first time then you might have to leave it disconnected for 24 hours to try again.