how to manually mark a thread as watched?

i only saw a post about how to stop watching threads automatically after you reply to it, but how to watch a thread manually? does anybody know?

Quote from Fatso

there's a watch thread option if you click the gear icon next to the emoji and paperclip icon

Quote from Mark-Lee

I took a screenshot for you, just click the icon:

https://ibb.co/zbJpPzJ

Quote from rainbowblink224

Press the little bookmark at the very top right of the page right under the magnifying glass

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Screenshot 2021-03-02 at 6.06.52 PM.png

or

Go to settings and click the check box

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thank you so much! you were really helpful