Setting Proxy

I am trying to connect my iPhone 3GS to my work Wi-Fi. I had this setup and working fine on my 1st gen iPhone, but I have been having problems with my 3GS. One suggestion was to change the proxy, or at least to check the proxy. The problem is that I can't find the proxy setting to check it. The Wi-Fi I am trying to connect to is hidden, and I need to go to the Chose Network "Other" to set it up. I know that if I tap on the blue arrow on a Wi-Fi location that is available that I can check the proxy settings, but I just wasn't sure how to do it if I can't fine the location I am looking for.

For background, when I select Other network and enter my name, security (supposed to be WPA Enterprise, tries WPS2 Enterprise), username, and password and tap join I get an error, "Could not find the network 'Name'"

Any thoughts?

Thanks,
Tim