This tutorial provides the details of displaying a form made with Gravity Forms in a popup using the Popup Maker plugin.
Step 1
Install and activate Popup Maker.
Go to Popup Maker > Add Popup and create a new popup named say, Contact Form
.
Click on Add Form button above the WordPress editor and select your form making sure Ajax is enabled.
In the Popup Settings metabox, add a Click Open trigger.
In the Display section, select Light Box Popup Theme.
In Close > Alternate Methods you might want to tick “Click Overlay to Close” and “Press ESC to Close”.
Publish the Popup.
Step 2
Edit your button anchor or button tag HTML and add a class of popmake-contact-form
.
That’s it!
Reference: https://docs.wppopupmaker.com/article/144-trigger-click-open