The activation can be performed in three ways:

Directly from be-on-road application:

If you have an internet connection available in your device, the activation will be performed automatically.

SMS:

Send an SMS in the format
ACT space installation code
(eg. "ACT AAAAA-AAAAA-AAAAA-AAAAA") on the telephone number +420 777 057 277.
You will receive an SMS with an activation code within a few minutes.

Internet:

Type your installation code in to the form on this site and click on the Activation button. Enter a generated activation code into the application.

Installation code is not your serial number. Installation code is generated by application after entering a serial number.