When Virto Kanban Board Add-in for Office 365 is installed, it is automatically added to your site on page Site Contents.
Click Virto SharePoint Kanban Board icon and open Virto Kanban Add-in.
Click “Settings” in the right upper corner and open “License” to manage your subscription and add users to the Kanban Board license.
Note: License management is available for site collection administrator only.
There you can check the status of your license and add users to the license.
Then you can return to the previous page and create a new board or choose an existing board to edit it.