Step 1: Go to NF Popup => Add new.
Description of fields show on Add/Edit Popup Page
Select Ninja Forms: Select the form you want to show in Popup.
Add Content Before Form: Content to show above the form
Add Content After Form: Content to show below the form
Popup Trigger: Select Auto Open if you want to popup to open automatically.
– Click : If you want to open popup on click of a button or Link
Trigger Class/ID: Set a unique name here e.g contactpopup.
Select Delay: Delay before popup is shown.
Step 2: Add created button code or shortcode to your page.
Example: <button class=”trigger_name”>Contact Me</button>
Then add shortcode to page e.g