Help me get power to my new box?

[kevschofield]

OK... Pretty basic question here I hope..

I compared to my home breaker panel but they are nothing alike..


This is a small Siemens breaker box with 2 Siemens 15A breakers in it..

I'm going to feed it power with a Romex wire attached to a receptacle on the side of the camper so I can plug an extention cord in and power the box..

The Romex has a black wire, a white wire and the copper ground wire..

I also have a very thick bare wire coming in to the box from the frame of the camper.

The directions are useless and do not mention power at all, only how to remove the circle plugs.

I'm thinking that the black wire goes in to the square lug next to the breaker and the white wire goes to the bar above the breakers?

For ground I just need to tie them together?
(There is no grounding screw or bar in the box)

Thanks,