It didn't do it automatically for me either, so what you gotta do is go over to the hashtag (#) symbol and look at the suggested feeds. Then, in the search bar, you put the pushpin emoji then click on the one that's only titled with that emoji. Pin to Home. Profit.

Apologies, it was 3 am and I had a brain fart. Yes, you have to actually do the step of pinning it to home 🙈