Thanks for writing in.
It sounds like you might be having an issue with a third party plugin(PopUp Maker). Regretfully, we cannot provide support for third party plugins or scripts as our support policy in the sidebar states due to the fact that there is simply no way to account for all of the potential variables at play when using another developer's plugin or script. Because of this, any questions you have regarding setup, integration, or troubleshooting any piece of functionality that is not native to X will need to be directed to the original developer.
You might want to check how to create pop up in x theme:
Or you could use plugin to create this popups in X theme:
Hope it helps.
Thank you for your understanding.