Go to your WordPress dashboard, click on Form Maker and click on the form you want to turn into a Popup form.
Next, click Appearance and choose Popup as Form Type.
You can then set an Animation Effect from the drop down menu, customize the time and frequency of the form’s appearance through Loading Delay and Frequency.
Choose the pages/posts where you want the popup to appear, set to display or hide the form for the administrator, display or hide on mobile, and choose the specific post or page where the form should be displayed. Otherwise it will display on all posts (if you have checked the post checkbox) and/or pages (if you have checked the pages checkbox).
Once you’re done setting these up, click Update and you’re done!