How to make a simple popup form in Squarespace
What you’ll need: A standard on page form
How to create it:
Select edit on the top left hand side of your site preview
Add a new form or double click on an existing one
Navigate to the the design tab in the form options menu
Toggle on the lightbox feature
Add custom text to the text for the open form button
Important info: This is not the marketing popup feature; this is a form that opens on a button click. This is also specific for standard forms and is not for newsletter blocks.