69 valiant electrical gremlin turn signal and license plate light

Okay so now I feel like an idiot. I took bulb out and held it in the position you see in photo and had my son flip lights on ,etc and the all worked. Issue now is I can’t figure out how to get bulb to stay in. There is a low bump amd a high bump on the lights obviously to say which way it goes in. When i had it on backwards it was causing parking light to cut off return. I am sure I am overthinking but how do I get the darn bulb In?image.jpg