How do I edit the Marketpress default 'Store' menu bar?

Hi

How would I edit the defaulted Store Menu nav bar? I seems counter intuitive because it has "Order Status" as an option. Is this only good for customers that log in?

By default, the menu is labeled as such:

Store
(sub-menus)
Products
Shopping Cart
Order Status

When I go to Appearance-----> Menus I can't edit the Store menu.. It seems to have a defaulted drop down menu.

Where are these files located? And how do I edit this? What is the best way to use this Store menu?

Thank you!