how to wire my sub and amp into a ready made box?

I have a 12 in subwoofer its a fosgate prime r2d4 4ohm or something and it looks like I have to push down on the button but i don't know where to put the wire at. Im a girl and clueless and want it done now and can't wait till morning to take to shop.any questions or if pics needed please feel free to ask thanks in advance.

I have a sonny xplode subwoofer in a box .420rms 4ohms 1800 peakpower .
What amplifier should i get in order to get the most good quality sounds.
I searched on google and it says that i should get a amplifier 50% more rms than my subwoofer

Ex. I have a 420 rms subwoofer so 50% is 210. So should i get 630 rms amplifier ? Or just match the rms of both ?

Im not really good at this i hope you guys can help me . Its for my car .
What brand do you recommend ?
what kind of amplifier should i buy .
Thank you !!!

My subwoofer and amp fuse is hooked up to the fuse box?

I didn't install it and was wondering if installing it to the fuse box instead of the battery makes a difference. I've notice when I play songs with heavy bass all the lights in the car seem to go in and out according to the bass.

Which subwoofer should i go with?

Alright so im kinda new to systems and dont know what would be best for me. I currently own a rockford phosgate p300-1 amplifier. I need to know what subwoofer would be best for me. I have looked at a 10" kicker comp vr but am not sure if my amp can handle it? I dont know much about rms and not sure what mine can handle. I am looking to just buy one subwoofer, but want it to hit hard. Any suggestions?