How to remove the radio on a 87 wagon and flasher issue

Hi, maybe it's a stupid question, but I don't really know how to remove the radio on my car. It's from a 91-92 accord or civic, something like that, and I need the serial number to retreive the code (unplugged the battery and I can't use the radio now). So do I have to remove the whole lower dash trim (it's just one big piece apparently, the black part)? Because I ried to pull and it doesn't move, and I tried to remove the cliamte control button but they look glued well. Any idea?
It's a wagon 87, sorry for the dirty interior.

Also my left hand side flasher is blinking way too fast, but both front and rear lights are working. Is is it juste a fuse or something?
It's a wagon 87, sorry for the dirty interior.

Also my left hand side flasher is blinking way too fast, but both front and rear lights are working. Is is it juste a fuse or something?
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