I have two #FeaturedHashtags on my #Mastodon profile. If you click any of those you will get all my posts that include the hashtag.

But, and now it should become more interesting!, if you want to find all posts with another tag I've posted with...then you can add /tagged/yourtagofinteresthere to the URL of ie. https://neurodifferent.me/@neurotypeprog

and then it becomes

https://neurodifferent.me/@neurotypeprog/tagged/yourtagofinteresthere

ie. if you were interested in all my posts where I've used the #ActuallyAutistic #HashTag then you can open this link:

https://neurodifferent.me/@neurotypeprog/tagged/ActuallyAutistic

It looks like I only got 2 of those.

As an exercise can you see if I got more than 2 posts with the Neurodivergent hashtag or less by modifying the url/link in your browser? If you don't have a #WebBrowser then this #MastodonTrick "#MastodonHack" won't work.