ConvertPlug allows you to set triggers that launch modules at the right time before the right users. You can set a trigger to display a module when a user clicks on a piece of text, an image or a media file on your webpage.
You can trigger modules using CSS Class within your website.
The following document is a stepwise guide to help you trigger a modal through a WordPress Menu.

Create a Menu Item you wish to use as a trigger for the popup.

1. Go to the “Appearance” tab in the Dashboard, and then “Menu

WP-menu

2. Create a Custom Menu.

WP-create_custom_menu

Make sure you do not enter a URL in the given field. Since we are not going to divert the user to another page.

Important:
Enable the “CSS Class” Option available in the “Screen Options” tab

WP-CSS_class

3. Enter a valid and unique Class Name in the field for “CSS Class” under the newly created Custom Menu.

WP-class_name

4. Save the Menu

5. Create and Design a Modal popup and open it in the editor. Click on Behavior.

WP-behavior

6. Go to Manual Display Options

WP-manual_display

7. Copy the Class Name you Entered under the Customized Menu Item, and paste it under the “Launch with CSS Class” field.

WP-launch-CSS-class

8. Save and Publish.