OK, was it fine before you charged the battery?
If yes, then check the battery voltage. 12.4-12.6 volts. Use a VOM. Then use the VOM and with the key on, check the fuses for battery voltage. If no voltage, then check the main breaker.
If there is battery voltage on both sides of the breaker, then the ignition switch would be the next thing to check.
At this point you will be needed some experience working with electrical systems and a valid wiring diagram. No idea as to your skill level, and no insult intended, but I doubt it'll get fixed with internet diagnosing.