How do you change Password Keychains?

[SamIchi]

So when I sign onto certain sites, it automatically puts in my pass and that's fine, but on Amazon, the wrong pass is inputted. How do I change it so it's correct?

 

[Makosuke]

Generally speaking, if you re-type the correct password the browser will ask you if you want to save the new password or keep the old one.

Since it's not: In the Utilities folder (in Applications) open Keychain Access. Search for an Amazon (or whatever) keychain item (it'll generally be in the "login" keychain, which is the default). Double click to open it, check the box and authenticate to show the password, re-type it, click save, and you're done.