I am trying to delete a folder in Yahoo. But my My Folders only has "add" and no "delete" or "edit" option???

Select the folder and hit the delete key on your keyboard.

To delete a folder, find “Folders” on the left side of your Mail page. Next to “Folders” are the links Add—Edit. See them? Click Edit. Schwing! A list of all your folders pops up under the heading, “Folders”. Beside each one of your personal folders are two links: Rename and Delete. Click Delete. Buh-bye, folder! But wait... You can only delete empty folders. So, if you want to delete a folder that has some messages in it, delete those messages first. How? Just place checks in all the boxes (or click Check All at the bottom of the list of messages, beneath the check boxes), and then click Delete. Or just right click on the folder and select delete from the pop up menu.