um.. lets see.. even though I dont particularly enjoy your presence, I suppose Ill help to the best of my ability. Seems rather simple what youll have to do, have a area to input text, and have it be read by the code. If its a match case of what the password should be, then have it go to whatever url your trying to get to. Im assuming this would involve a couple if & else's, but Im also very basic in my knowledge.
