The provided targeting section allows for only one URL to be entered. However, if you wish to target more than one specific URL to display or exclude your Countdown Timer Bar, you can do this by using the keyword section, and entering the path (the trailing section after your web address suffix) of the URLs you wish to target.
This method works for both Display on Page and Exclude page sections.
Here are the steps.
1. Go to a page you want to target.
2. Highlight and copy the path, the section that follows .com, .ca, .au, etc
3. Paste the section into the targeting by keyword section
4. repeat the process for each page you want to target. Separate each path with a comma.
Save and test.