Always be sure to stay within the newly created adgroup when making adjustments. You can do this by clicking on the “Display Network” tab and then selecting the option reading “Interests and Remarketing.”
Click once on the option labeled “+ Change Display Targeting.” Choose the button labeled “Remarketing Lists” and then highlight and select the remarketing list you previously created. Click the “Save” button when you’re finished.
Now that your remarketing campaign is all set up, it’s important to remember that your ads will not start showing to visitors until at least 100 unique visitors are tagged within a period of 30 days. After that, previous visitors will start to see your ads more often.