Unable to Add Listing(s) to Directory

Hello:

How can I add listings to my directory?
How can I add listings when I am signed-in as an Admin?
How can users (i.e. Directory Members) add listings?

When I select Sign-Up from my homepage (whether I am signed-in as an Admin or accessing as an anonymous user) I receive the following message: "Sorry, we can't find the content you're looking for at this URL. Please try selecting a menu item from above or to the side of this message to get where you'd like to go."

Please help.
Dominiqui