Initially, version 6.0 of the Local Staffcounter Server doesn’t have a field for a license key. 

If you installed this version and want to register it, you need to manually modify it. 

Download the file dash-board.phtml.

Update / upload this file  to the folder 

/var/www/client/application/views/admin/index/ 

on the StaffCounter Local Server container via SSH.

And then you will see the Licensing UI elements in Admin panel like here – 

Note: If you can’t overwrite it over ssh, then upload it first to /home/vagrant via SSH, 

and then from console session copy it to /var/www/client/application/views/admin/index/