How to edit labels in the integrated form for Retina, Mobilia, Responsive, or Parallax themes
If you're using the theme integration for Retina, Mobilia, Responsive, or Parallax it's very easy to customize the labels in the form.
The form is part of your store theme. You can edit the form labels in this form using the theme language settings:
1. From Shopify admin go to Themes.
2. Choose 'Edit language' from the dropdown action menu.
3. Choose the Products tab and scroll down to the Notify Form section.
4. Change text as required and hit Save.