First, make sure you are on your state site page. Teams are not found on the National - www.milesplit.com - portal.
If for instance, Texas - http://tx.milesplit.com/teams
Substitute your state abbreviation for TX
( this is the list for Texas team pages).
You can also find the teams list by clicking on the "teams" tab on your states home page.

If the school team is not listed here - http://tx.milesplit.com/teams
then please send the following info to registration@milesplit.com and we will get you all set -

To add a new school, we need the following info:
Category: HS, MS, College
Name of School:
Address, 
 street - required
 city - required
 state - required 
 zip - required
County - required
Phone
Website (if applicable)
Coach MileSplit user email