How do see my folder in my yahoo mail?

What you are looking for is actually below that (under the heading ACCOUNTS). Any account this is IMAP enabled should show you any folders created on the server.

Also, if you tap Edit, then Add Mailbox, you can add any folders from any of the accounts you wish to the upper list (and re-arrange the order).

At the bottom of the list should be a see all folders option.

I also use the yahoo mail organizer and have this option if I select yahoo inbox, then scroll down.

You're welcome. Glad you got things working.