Allow users to add trips to lift sharing site

This is a follow on from my userlogin project. The project is for my new car sharing website gizalift(.com) I now want to Allow users to edit user info after they login to the system. I want them to be able to add a 'trip' to the system. A trip consists of a start and an end location, with another table which contains lots of other locations that they will pass through on the trip. Users should also be able to search for a 'trip' by the start location and any of the intermediate locations and the end location. Ie, if they put there start as a town called SmallVille and the end Town LongVille, then the database should return a list of all trips that contact SmallVille and LongVille in that order. A trip can be a regular weekday trip to the office, a daily, weekly, monthly or a one off trip. A trip can be one-way or return, but usually return. I hope this is clear, it's not a big project, but quite different than the norm. I have already added the tables to the database and the username and login system is already complete.