How can I remove the app from a site?
If you no longer need the JungleMail for Office 365 app on your site, you can remove it by going to the Site Contents page. Note that to remove an app, you must have Full Control permissions (Site Owner, for example) for a SharePoint site.
1. Go to Settings > Site Contents.
2. Find the JungleMail 365 app you want to remove and click the ellipses (. . .) to view the app properties. Click Remove on the menu.
3. Click OK.