Car doesn't get any power?

I have a 1991 Honda civic wagon, I had a bad battery, I tried to charge it but it only had enough power to turn on the lights and dash, the lights were dim though… So I decided to change the battery but I connected the wiring terminals so now the car doesn't start

Could be a bad ground, Fuse, Or short in wiring some where.

No power

You have blown a big fuse in the fuse box. It will be one of the large screw in type that you have to remove the terminals to get out, I think that there's about 3 of them. Take them out one at a time and check them with an ohm meter or test light if you know how. If you put the battery in backwards, you probably don't so just have the car towed to a shop.

Replace the terminals but when you do cut the corroded part of the cables.