There are 2 main pairs of credentials:
First, your
Indigo Account login information which is used to authenticate Indigo on first launch and used from your browser if you want to check your subscription status, purchase an upgrade, get a trial, etc.
Next, is your Indigo Server credentials. This is set by you in in the Start Local Server dialog of Indigo on your Mac. That is used to access Indigo Server (for home control) from a browser and Indigo Touch (iOS client). We don't have control over those credentials (we never see them), but you can reset them via the Start Local Server dialog on your Mac.