OK imagine a 10 person table. Now imagine the button on that table. Now rotate clockwise.

First is the small blind (SB)
Next is Big Blind (BB)
Next is Under the Gun (UTG)
Then UTG +1
Then UTG +2
Then Middle Position (MP)
Then MP2
Then MP3
Then Cut Off (CO)
And we are back to the button.

If you have less people, you take off positions.
1st one to leave is MP3, then UTG +2, then MP2, then UTG+1.

Hope that brings it to light.