I got it, but it's not the same as you instructed. Hovering over a name doesn't do anything for me. Maybe we are using different versions. For the possible benefit to others here is what I did:
I had to go to Contacts, select the Channels tab, and select the channel. From there I could see the members. I clicked on the member to remove, selected the ellipsis to the right of their name, scrolled down and selected "Remove from this Channel", then a dialog box asks me to confirm removal. Once I clicked Remove to confirm, the member was deleted.
Thanks for your help in getting me to look deeper.