Firstly you need to give more info, a) about your database - details of tables, field names, data types, etc, and b) about your form - field names, input types, etc (maybe post up your html code from FrontPage).
If you want help with this you should also probably show some evidence of having made an attempt at it yourself (see 'Posting Guidlines').
I'm not very familiar with MS Access in terms of using it in conjunction with PHP for websites. I'm not even sure that it's possible. Does anyone know??? I'm not sure how much knowledge you have so apologies if this next bit sounds patronising! When you get PHP to make queries to a database you obviously can't get PHP to click the buttons in Access for you. You have to write commands, e.g. to get all the records where the value of 'column_name' is 'pizza' you would write something like:
SELECT * FROM table_name WHERE column_name="pizza"
Mysql is a very popular 'open source' database application (open source meaning it's free, and is being constantly improved by lots of programmers all round the world (as is PHP)). It is by far the most commonly used database with php. If you get stuck using php with mysql there'll be lots of info available and lots of people with knowledge about using them together (like me!). You can download it from
http://dev.mysql.com/downloads/.
You also need to consider where you are going to host your website. And what database applications the web host have on their web server. I can highly recommend these people:
www.hostultra,com. Very cheap ($20/yr), very good, and they have mysql and php installed on their server(s).
Good luck