Change fields in database(MySQL)

[Tinus]

I'm making a guestbook. I want to make a admin part so i can change the fields in the database.
What I want is that if I go to the admin part I can see the fields in a text-input (<input type="text" value="<?=$bericht ?>>) and if I change it and press the button it changes it in the database.
I get the information in the text-input but when I press the button nothing changes.
The query isn't the problem
Can someone help me because it is starting to irritating me.

p.s. I'm working on my English

[pyro]

You didn't really tell us anything except that it is not working. Maybe you could post the code that you are using, and how do you know it's not your query? Did you test that?