How to Add Apps to a SharePoint Site

Step 1: Log in to Your SharePoint Account.



Step 2: Locate the Settings icon on the top right corner of the page then click on it.
And click on the Add an App link in the SharePoint settings.



Step 3: Choose an App to Install. In this example, we attempted to install a simple productivity app, called Tasks.



Step 4: Give your app a name and click on the Create button. The app will be installed.



Step 5: You can download More Apps from the SharePoint Store.
Go to the SharePoint store to download more apps that boost communication, collaboration, productivity, and more.



Step 6: Search or browse apps and choose an app of your preference.



Step 7: Click on the ADD IT Button.



Step 8: Go through the app description, understand their terms and conditions,
and then click on the Continue button to add the app to your SharePoint.


Step 9: Once the app is installed, click on the Return to Site button and you will be back to the SharePoint site.



Step 10: Grant Permission to the App by click on the Trust It button to finish the installation process.



Step 11: You can check your Installation by going to Setting and click on the Site Contents link.




Credit : https://www.cloudfuze.com/how-to-add-apps-to-a-sharepoint-site/