The title header when viewing a search for #rats in the Tusky app. It displays the hashtag, a follow/unfollow icon, and a mute icon.

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   Nihl L'Amas (nih_llamas@mastodon.social)'s status on Thursday, 15-Jun-2023 18:00:14 JST Nihl L'Amas

   in reply to

   @bbaster @feditips I can't find a way to do it on the official app.

   I use Tusky for my app. After I tap on a hashtag and see a list of matching posts, there is a person icon in the upper right with a + next to it. Tapping that will follow the tag, and change the + to X (ie, tap again to unfollow). The website works similarly.