Gmail on the new ipad

There is a list of mailbox functions on the left side of the stock mail app, there are folders there that say
"Sent, important, deleted etc." can we add and and delete folders there and if so how do we do that?

Thank you in advance

Sandy

 

This shows Yahoo, but will work the same for GMail.

http://www.ipadforums.net/new-member-introductions-site-assistance/68936-email.html