Hello @indra043 – thanks for writing in!
You will need to set the Targeting Condition to Posts: Selected and on the input field, simply select a specific post, that way, the popup will only be displayed on that single post. To make it more clear for you, please see this screencast from my own test site: https://share.getcloudapp.com/d5uEeg0j
Could you please try that and let us know if that works for you?
For more insights, you can also check out this documentation about Standard Targeting Conditions and go directly to Posts.
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If that works for you then we would very much appreciate it if you could quickly rate the plugin, just to help us spread the word.
Otherwise, you can reach us directly to our HelpScout support desk. Check this link: https://wppopupmaker.com/support/ Thank you.