Editing Module

I am wanting to write an editing module for one of mySQL databases. It contains address and contact information. I am not exactly sure how to go about this. I get the idea --- search for the record but my question and where I stumble is this: How do you get the computer to remember the old record so after you search, find and display it, type in changes in a web form and then do the replace. I don't want to create a new record, but update the current record If my database looked like Ron / 12 Apple Street Gordon / 1435 Frank Street Tweedy Bird / 1 Here We Go Way and I want to update Gordon ... I know how to search and display it ... but how would go into Gordon and change his address? If any if you are able to respond please send a copy to my e-mail address ron.php@actsministries.org Thanks Ron