My brother replaced my battery and did not re-connect the power cable that goes to the amp.

I was wondering if this is what i need to do

1) Remove negative cable from battery
2) Remove bolt on positive, Place the ring looking thing that is attached to the power cable and then crew the bolt back on. So the ring screwed up against the battery (similar to the ground wire but against the battery instead)
3) Connect negative cable.


Please correct me if im wrong as i am pretty unsure...