I ticked the box by mistake, now I cannot undo this AARRGGHHH !!! it’s so annoying, it even remembers my new password when I tried to change it.
Are you using Firefox? Go to Tools > Options > Security > Saved Passwords. Remove the yahoo password.
On IE, go to Tools > Internet Options > Advanced. Under Browsing, remove the checkmark in the Use Inline AutoComplete. You can also go to Tools > Content > AutoComplete Settings to delete AutoComplete History.
While in FF or IE, you can also remove saved passwords by pressing Ctrl+Shift+Delete.
sign out. And when you log in, uncheck the Remember me button. Also clear you browser for saved passwords, as it stores a lot of them. For Google Chrome Tool sign in the upper right corner -> options -> Under the hood -> Clear Browsing Data -> check only saved passwords. And you should be good to go. Similar steps for IExplorer and so on..