... I'm thinking I need to do a reset back to the factory settings and start over ... any thoughts?
You might, but before you do that please determine the model number of your Express: look on its case for a four digit number precedeed by the letter A.
Also, please determine the version OS X you are using, or if you intend to use an iPad / iPhone to configure the Express. On a Mac go to > About This Mac. The OS X version appears under the big OS X icon.
Finally, the page you linked above discusses configuring a Wireless Distribution System. Is that what you already have, or need to do?