How To Set a Popup (Weblayer) to Pop Only on a Particular Page

On Flashy you can set a popup not to be activated on a certain page.

Enter "AUDIENCES & RULES", then click "ADVANCED FILTERS"

You can set the popup to be activated only if the URL of the page the visitor is on contains a certain string.

Setting a Popup (Weblayer) Not to Pop on Several Particular Pages

If you want to add more pages on which the popup will be activated, you can click "Add new filter" and in the same way described above add strings from the relevant URLs. 

Please note, you will have to select "Match all filters" – so that the condition will be an "OR" one – the popup will be activated in a URL containing X, Y, or Z, etc.