How to remove a third party SharePoint app from Office 365

Log into Office 365 with an administrator account

Navigate to ADMIN>SharePoint Admin Center

Click Apps

Click Manage Licenses

Click on the app you want to remove

Click on the dropdown ACTON’s item and select Remove this license

Click OK

Navigate back to the Apps Menu

Click App Permissions

Click on the black cross (x) next to the app you wish to remove

Click OK

Your app is now removed.

Next to look at how to remove SharePoint apps using Powershell.