So, how does one tap into a feed like medsky or milsky? Or should I simply run a Google search....?

You can find the Medsky feed at this link. There, you can add it to your feeds. Clicking on the pin icon in the top right will pin it to your home screen. To get your skeets/posts into the feed, just include the word "Medsky" or add the 🩺 emoji. :-)