Create mailing list from subscribers

I'm baffled.  I'm trying to create a new mailing list to my subscribers, so I can send them mail.  I can't see a way to add my verified subscribers to a mailing list.

Nor can I figure out a way to delete subscribers who don't want to be on the mailing list.

This is frustrating.  I'm working with a website to support a grieving family and I don't need this frustration right now.... 

Does anyone know how I can do this?

Thanks.

I'm also wondering how to add a subscriber to a specific mailing list... there is no obvious way to do this in the backend. Would love an answer if anyone knows how!