How do you modify existing pages?


I've run into 2 problems. I have added the validate unique value and re-run the create pages wizard for the Administrate users. The first problem is that the search form now requires an email address, which I don't want to require for search, only for inserting new person, just to check for unique value.
The second, on another set of previously created pages, I have a registration form, but I don't see a way to modify the existing pages to add the unique validation to it because there doesn't seem to ba an update pages option in the manage pages. When I try to select pages to modify, the option is greyed out.