How do I reorder the videos in a Youtube playlist?

I checked their help section, and it says that you can click and drag the videos into the order you want. I've tried clicking on both the thumbnails and the titles, but the click and drag doesn't seem to work. Is there another way to do this?

And I did do an internet search, but the answers were all referring to how it was done a couple years ago (typing in the numbers, which no longer seems to be an option). Now there is just a box to check, but the only option seems to be to move them to the top or bottom of the playlist, not to rearrange them.

Thanks!