That is a great question! If you search for "Explora" in the HelpDesk you will probably find a helpful tool or two as all their sources will automatically give you MLA citations but a GREAT place to go is the MLA Style Center.
The "Quick Guide" is especially helpful and you should take the time to work through it, click the image to get started!:
They have a SLEW of resources ready to help you including paper examples, full papers! On how to style your papers. Head there now!