You can set the login and password in iCamSource (on your computer) to be anything you want. If you forget your login or password, you can just change them to something new on iCamSource.
Are you running iCamSource on your computer? If not, you can get the Mac or Windows version here:
http://skjm.com/icam/support.phpYou need to run iCamSource on a computer with a webcam in order to view the webcam on your iPhone.
As OUAnthony mentioned, you can use a USB/built-in webcam or an IP camera that outputs MJPEG formatted video.