I've had one of those in my van for a couple of years now and TBH I had completely forgotten about the app (TK Star) as I've never had occasion to use it again! I've just gone into it and the login details were all saved to the phone so it logged straight in. I would however say that when I had a couple of issues with setting it up in the first place and also when I was getting the odd spurious alarm, I contacted Steetwize and they were exceptionally helpful (and quick) in sorting things out - IIRC, I dealt with a guy named Mark. I'd recommend you give them a call or ping an email.