That page at Advanced Tools > Feature Installation/Configuration > Contact Form > Feature Settings is for manually adding feature settings via the UI, when using the installation system you don't need to do anything on that page and should not becuase those settings will be updated according to the config file whenever you visit /Setup/Default.aspx.
That particular setting defines a module Setting aka feature setting for storing an email address. The resourceFile is the name of a resource file but without the extension, so it corresponds to ContactFormResources.resx which lives in the App_GlobalResources folder, the setting name/label will be looked up from the resource file, this way it can be localized by creating resource files for other languages like ContactFormResources.es.resx for Spanish
In this case we have defined a TextBox because the setting is for an email address which contact form messages are sent to. If you put an instance of Contact Form on a page then click the gear icon next to its title you will see the feature instance settings for the contact form instance and you will see the textbox where you can enter an email address.
Hope it helps,
Joe