Are you talking about the pattern lock? The password is usually the password for your Gmail. Did you forget your Gmail password? If so, you can follow this link to recover the password: https://www.google.com/accounts/recovery. If that doesnt work then the option may be is to reset the device by using the hard keys.
Resetting the Samsung Intercept restores all factory defaults, including ringer types and display settings. All data, including downloaded applications are deleted.
Using Hardware Keys Press Volume Down, Talk key and End key until Android system recovery screen appears. Use Optical Joystick to highlight Wipe data/factory reset, then press Optical Joystick. Press Volume up to continue or Volume Down to exit. Once wipe is complete and reboot is highlighted, press Optical Joystick to reboot phone. Phone will be rebooted and customer returned to Home screen