how to create a team and add members?

I have a chess class. how to add students into a team so that making tournaments possible

Alright. For you here's what I find best...

Create a team and set "joining policy" to "a confirmation is required to join"
Tell your students to join the team and tell you their lichess names.
Only accept them if you only want to accept your students.

Once that's done, when creating a tournament, go to advanced settings, and set "Only members of team" to your team of students and they can join!

Also this lichess blog has more helpful information as to how to run your chess club online
lichess.org/blog/XnEFmRAAAB4A7WU7/running-your-chess-club-online

I wish the best luck to you and your students! :)

Your students will see the team name on your profile all's they have to do is click on the team and it takes them where they can join.

Hi!
Thanks nyeh-heh-heh!
Thanks Kanaan92!