How to use net classes in KiCad 8

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Hi all, i am looking for a tutorial how to use netclasses in KiCad 8. I followed some youtube videos and tried a following the youtube videos but it does not work.

What i want to do is create a custom 50 Ohm constraint by making use of netclasses.
I tried it in the pcb editor alone but i do not know how to add nets to a net class and then let the net class perform the constraints, While i refill the zones by pressing B.

I looked in the documentation but i see not a good example.

Thank you in advance for your help,

Regards William.

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Some good info here: How to assign net classes

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Thank you.

I just figured out how to do it by first adding net class directives in the schematic.
I add those giving them names 50OHM1 and 50OHM2.
Then , update the PCB.

Goto Boardsetup.
Then add Netclasses with the same names : 50OHM1 and 50OHM2.
Edit the clearances and the track width to represent a 50 Ohm copper trace with respect to Ground, for each net class.
And then when i fiddle with the trackwidth and clearance, after pressing B, i see the changes immediately being drawn by KiCad 8. Excellent.

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