You will need to go in your web browser and clear the saved password.
Alternately when you sign in you should get the option to "update" your password in the browser so that it automatically puts in the correct password.
To clear browner history in Firefox:
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In Firefox, click the navigator button 
on the top right-hand side of the screen.
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Click on Library, click History and then click Clear Recent History.
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At the pop-up box, change the Time range to clear to Everything and confirm that everything but Site Preferences are checked and click Clear Now.
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Reload UWinsite Finance and try the task again. Please note that you will have to log back into UWinsite Finance.