View your apps
Select More apps 
on the left side of Teams. Here you'll find:
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Your personal apps. Any app you've added that offers a personal view or workspace.
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Your team apps. Apps that have been added by your IT admin or a coworker for the teams you're in.
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Custom apps you've uploaded. If you're a developer and have uploaded custom apps, you'll see all those here, too.
Whenever one of your team apps has something new to tell you, a red number shows up next to the app icon, letting you know how many notifications you have.
View apps for a particular team
Find the team name, then click More options > Manage team > Apps.
You'll see the apps added for your team, and you can delete and add apps from this screen, too!
Haven't added any apps yet?
Go to Apps 
in the left side of Teams and browse what's available. Please note, some apps require you to login with account credentials.
You want to read on the Microsoft site then click here
