That "page" isn't active in the current build; if you want to change settings (after a videofile loaded): rightclick > Options > Filters > Advanced.
Also you can use Enhance 0.17 (I can only recommend it!) (Check "Enable Winamp DSP plugins" under "Audio"/"Winamp DSP2 plugins"; No need to check "Enable advanced plugins support", just leave that unselected). The selected plugin will load automatically if a videofile is loaded. Also you can only access Enhancer's "Config" when a file is loaded. (rightclick > Audio > DSP plugin)