Show a popup rules are triggered the same way as other EG rules. The difference is that instead of adding a product automatically, they show customers a popup with a selection of products they can choose to add to their cart. This works particularly well if you want to offer a gift like a T-shirt where the customer needs to choose a size, or let them choose between a red or blue T-shirt.
See this rule in action on our demo store here: https://easygiftdemo.myshopify.com/products/chronograph-i
Interested in setting up a rule like this? Follow these steps to create your own:
Open the EG app from the Shopify admin page.
Create a new rule and name it appropriately.
Set the rule trigger you want to use.
In the rule action section, select Show a popup. This action is available on paid plans.

Select the products you want to offer to the customer when the rule is triggered. The Standard plan allows up to 6 products per popup, and the Unlimited plan allows more.

Configure the contents of the popup shown to the customer. Write an engaging headline and sub-headline to tempt your customer to buy more.
You can show or hide the prices of the offered products.

Apply other settings for the rule such as schedules, magic links etc.
Remember to save your rule.