How do I have a teacher submit a letter of Recommendation

Hi! Im looking everywhere but I can’t find out how to let a teacher submit my letter of rec. Any help?

Are you on Naviance? You can invite your teacher using their rec. letter app. Or via Common Ap.

However, rec. letters aren’t required for UMN.

I am aware they aren’t necessary, but I wanted to include it since I felt as though my application was incomplete without it. I actually ended up calling the school and apparently he can either email it or mail it.