Installed new battery and have no power at all.

If you are lucky, you might have only "blown a fuse". I do not know about Hondas but reverse wiring a battery typically will fry other components like the electronics. I would start with your owners manual and a few hours on the internet to look for solutions.

Or a fusible link in the under-hood power supply/relay/fuse box. You should be able to see where the positive battery cable goes to a stud terminal under the cover. That usually goes to a fusible link, then to a second stud to the left or right of the first one. That cable should go out to the alternator & starting/charging system. If that link is there it should have burned out and would give you a no power condition.