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In Voyager, you need to enable the feature under Settings -> User Tags.

Voyager implements it entirely on the client; it’s not a feature of Lemmy. Therefore it isn’t available via the Lemmy website.

However, PieFed does have backend support for user tagging. On a PieFed account, you can tag users through the website or through Mlem.

There’s a button for it in the toolbar above the keyboard. You need to scroll horizontally on the toolbar to see the button.