HTML Templates modification in module pool Screen

Hi Friends,

            I am Working on an existing custom Module pool program where my req is to add few field in screen. For this Screen there is already an HTML template got generated. While i am trying to change screen it is Promting an information message stating that

HTML templates exist for screen ZWM_RLMENU_TEMP
9001. If you make changes to the screen, you
must modify the HTML templates manually.

How do i modify the existing template with addtion to new field in screen  ??

Please suggest

Regards,

Lokesh