Before You Begin

Make sure that you have Removed the Add-In from Site Collection Recycle Bin

Step 1: Login to your Office 365 admin center page with administrator account, then choose Admin


Step 2: 

Go to SharePoint Admin Center

 Or in the new admin center

Step 3: Select Apps then Click on App Catalog

Step 4: Open Apps for SharePoint

Step 5: 

Find ShortPoint item and right-click to open the context menu and click Delete.