Trying to add a form field to Photoshop Image

I am using Photoshop 7 (on-XP) and am trying to edit a web template. The template has 2 form fields (login and password) and a submit button. Is there anyway I can make it so someone can type text in the 2 form fields, and also how do I add the action to the submit button. I thought it might be able to be done with the slicing tool.

use a text editor to edit the .HTML file and modify the HTML source code.