Clash Royale Cheats

How do i activate a Steam Key through the Web Browser?

Whenever i go to activate a code through Steam Client my entire steam freezes every second and i am unable to even copy paste the code, i wanted to know if i can activate the keys in the web because from the client its impossible

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Edit: Just to clarify, the problem with the Steam client freezing was caused because of my Friend Box, when i open the friend box all steam together with it freeze for some reason