How can I update a user's password in a table when they change their password?

I've asked this a few places, all of which feel that the question wasn't clear... I'm just trying to make it so that when I pull up an admin page that I created to show my data tables, that it shows the changes made to those tables. Most Primarily of which is the user's password. I tried using UPDATE; no exception was thrown, no errors occurred, it just plain didn't do anything, not even to the table in question after refreshing it. I would appreciate an example of how to use UPDATE in the context that I trying to accomplish. However, any help would be appreciated.

question is still not clear. what do you have so far? post your code that is not working for you.