Drzazgatron

I'm having trouble with the "how in God's name does this stupid bulb go in this GD thing!?!?" Got an after market blub (only bulb, has a cord) doesn't look anything like the 1 I pulled out (bulb attached 2 plastic fitting). If the bulb in the fitting comes out idk how 2 remove it and almost b4oke it. Could some1 please help me out and clear up some of the who, what, when, where, and why? Please and thank you, Drzazga