Fil in webbrowser textbox by Class Name ?

[tweaker99]

Im making an auto fill app. But i got a little problem there are a few text box's that do not have names or id's they just have a classes.... For instance password 1 & 2 are the same i think.. I can fill the 1st password by the nam "password"e, But the 2nd box wont fill. How would i fill it by the class name ? Or if there is another way.