If you see the screenshot below, that means United has been locked out of Jumpseating again do to careless users not entering the correct user id and password. It usually takes 24 hours for the site to let us back in. If you email me about the site being locked out, there is no need for me to reply. If you want to know what the correct user id and password, read the first FAQ.
It may be possible to list via Together->Travel->Other Airline Interline Travel - Additional Resources->Additional Resources->MyIDTravelListing