For video instructions follow link below:
Otherwise follow steps below.
Microsoft Office apps can be found on your Start menu. If you don't see them, you can install them yourself.
Go to office.com. You might need to sign in with your work account.
Select Install Office > Office 365 apps > Run, and then select Yes.
The Office apps will be installed. The process may take several minutes. When it completes, select Close.
To install Microsoft Teams, go to the office.com page, and choose Teams.
Get the Windows app, and then select Run. Teams displays a prompt when installation is complete.
The Office apps you installed now appear in your Start menu.