How to give my dealer/reseller permission to manage my CTOUCH touchscreens?

The end user does this by means of entering the dealer code in the settings, which he received from his dealer/reseller. (Tip: as a dealer before installation, send the request to create a Sphere account and pass the dealer code, so that the end user immediately gives the dealer permission). Revoking this permission is easily done by removing the dealer code in the Sphere settings.