First Headlights now Ignition

I have another problem. I got the headlight switch in perfectly. My headlights work without a problem but now... my key won't turn in my ignition. HELP ME!
Metromanic

sounds like you didn't bolt everything together right. Or, you just need to jiggle the steering wheel, because it locks when you turn the wheel with no key in it. Every car does it. Try turning the wheel back and forth while you turn the key.