How do you remove untitled folders off of dialog box on my in mail Yahoo page. Be gentle; I am PC illiterate.?

I some How clicked on 7 plus one empty folders done over time, just noticed today a whole row is starting to line up will soon run down over my keyboard. and I cannot find a take off only add so that is how I got my 7th untitled folder, I pull the folder up it says empty but no delete shows on top tabs so I can whisk it away. I refuse to try again I will then get NO. 8