Im sorry this happened to you. As a commuter myself, I fully understand your frustration. I too make the walk up to gate to area to make sure nobody is left stranded.
As far as correcting the ID90travel login issues, that would be through your own airline's jumpseat coordinator, not ours. That website isn't specific to Frontier, and the login info you provided is generated by Southern's travel/jumpseat person.
You can also list by calling (800) 432-1359. Also, check out our jumpseat policy on Apla's website http://www.jumpseatinfo.org/AirlineJumpseatPolicies/tabid/1592/Default.aspx
Again, very sorry this happened to you. We are always happy to take as many jumpseaters as we have seats.