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1. Go to the Setup page, by clicking on the Setup menu.

2. On your left-side, under the App Setup section, click on Installed Packages.

3. Click on Uninstall link besides the Celoxis app.
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4. On the Uninstalling a Package page, scroll to the bottom and 
   1. Select Do not save a copy of this package's data after uninstall. Click on the Ok button displayed on the message box.
   2. Check the option Yes, I want to uninstall this package and permanently delete all associated components.
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   3. Click on Uninstall button.
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The Celoxis app will be deleted from your Salesforce account.