I need some help. I have a website where people can create a class or event with times and places for the class or event. Once this instance is created they are supplied a link for people to sign up and a passcode for them to use to modify the class or take attendence for the class, or change attendees for the class. I have never done a login page before. I have read a lot about them but I cannot find anything that just uses a passcode to login. The passcode is stored in one of my SQL tables. I have about three or four pages that require the passcode before the user can go to those pages. I do not know how start doing any of this. I need help please.