How I can delete "Google Docs extension"?

I have a problem to delete the extension, wich I installed by link from front page

I can’t finde it in extentions menu or google drive extentions and spend one hour in searching how to fix it!! WTF? HOW I CAN REMOVE IT?

In Google Docs, call the menu Add-ons -> Manage add-ons... and then click the Manage button.

thanks man!