You will need to access your Google Apps settings in Google Drive to unauthorise (disconnect) the Kanbanchi application. First, open Google Drive (https://drive.google.com/#my-drive) and click on the Settings wheel located in the upper right hand corner of the screen. Select Settings from the provided drop-down menu and then Manage Apps.
In the Manage Apps Screen for Google Drive, scroll down until you see the Kanbanchi App, click on the Options drop-down menu, and select Disconnect from Drive.
Click on Disconnect in the provided confirmation window to finish disconnecting the Kanbanchi Application from Google Drive.
The application will automatically be disconnected. Click on Done to close the Manage Apps Screen and return to Google Drive.