Once you join a new team, it’s instantly displayed in your teams list. If you know you’re a member of a team but don’t observe it, scroll to the bottom of your teams list and press See all teams.
Show a channel
Press Teams and find the bottom of the team list. Tap See all teams, then choose the team the channel is in and press the circle beside the channels you want listed. To hide, touch the circle again to deselect it.
Note: To help get you up and running, Teams automatically shows the five most popular channels in every new team you join.
Delete a channel
Locate the desktop or web app to delete a channel.