From the welcome message:
… To do this, go to the category page and click the rightmost button. You will then have the option to watch, track or mute the category.
– there’s a broken image placeholder for https://yalam.co.uk/i/3a2211d7.png, which is:
Sorry, I didn’t realise that Bugzilla can/should be used for meta issues such as this.
I’ll flag this topic for closure/archiving/deletion.