How do I create and add to a playlist?

On X1 remote, when you click the Xfinity button, you are given a bunch of options. I select “Saved” and then scroll all the way to the right and come to “Playlists”. 

it shows three playlists I had previously created with a couple items on each list.

i want to create a couple more playlists and add content to each. This way it will be easier to go through “My List” when I’m looking for a specific genre (like all movies on Pluto). It can’t be that hard, I’d done it before, but I can’t figure out how to do it now.

or is this another useful feature that is no more.