Go to Teams and choose a team. Then, look through the available spaces, and click Join This Space when you find one you'd like to join.

Go to Teams and choose a team. Then, look through the available spaces, and click Join This Space when you find one you'd like to join.

Go to Teams and choose a team. Then, look through the available spaces, and tap on the one you'd like to join and then tap Join the Space.

Go to Teams and choose a team. Then, look through the available spaces, and click Join This Space when you find one you'd like to join.