How do you create logos on nba2k17

I downloaded the ncaa2k17 stuff, but want to add LSU into the mix. Had the court pretty much down, except when I got to mid court logo. It doesn't allow you to put the letters in mid court, only load graphics. Don't see an lsu one created, so wanted to see if I could create one on my own. Just not sure how to do it. Anyone knows?