First steps after first install: trying to activate Flakes permanently

First steps after first install: trying to activate Flakes permanently:

Flakes - NixOS Wiki suggests
nix.settings.experimental-features = [ "nix-command" "flakes" ];

sudo nano /etc/nixos/configuration.nix adding the line has no effect after reboot. As a newbie I am missing something fundamental… Thanks!

Did you also rebuild your system?

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What about study this guide: