Log into the app, then click on the My Account avatar icon in the upper right corner. Under Settings, click on Manage Schools and search by school name or zip code. Be sure to double check you are supporting the correct school! Many schools have similar names. Searching by zip code is often the best way to search for a school.
Coordinators can update the school for which they coordinate at https://www.boxtops4education.com/s/ by logging in as a Coordinator. Then go to My Account, and then to Settings and click the appropriate link. If you don't see the school you are looking for on the website, log out of the website, go back into the app and add the school under Manage Schools and then log back into the website.