To create your offer, click "Offers" in the orange circle

Click "Add Offer"

Fill the different forms to create the offer and Click "Save"

The Toggle for “Show Offers/Events Popup on Page Load” this setting controls whether a popup window appears automatically when someone opens your website page. It can display special offers, events, announcements, or promotions.

Toggle the Offers / Events Section & Show Offers/Events Popup on Page Load ON.
Use the switch next to it to turn it ON (activated).

Save your changes.
Click Save to apply the update.

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Website View: