How to add interfaces to a port

[jasonburrows]

This sample page, right from Sparx, shows a port with a provided and required interface:
http://www.sparxsystems.com/resources/uml2_tutorial/uml2_componentdiagram.html

...but for the life of me I can't figure out how to make that happen.  How can I put interfaces on a port?
Using EA 7.5.850.

Thanks.

[jasonburrows]

...figured it out for anyone who's interested.  There may be other ways, but if the port already exists you:
-Create the interfaces you want on the host component using the "Expose Interface" tool.
-Drag them into the port in the Project Browser.