Often times when testing tags in a live environment it’s advantageous to be able to add yourself to a segment. Salesforce allows users to add their KUID to any segment using “Test Mode”. Please make sure the segment is activated for "Send to Site".
Here are the steps to add a user to a segment
Once the segment has been enabled for test mode, click the gear icon again to expand the dropdown menu. You will see two new options: “Add user to segment”, and “Remove user from segment”.
Once you have been added to the segment, you will receive a confirmation message:
Once you have completed testing, simply follow steps 2 and 3 in reverse. Click the gear icon and “Remove user from segment”, then “Disable test mode”.
Note: The option to add or remove a user from the segment will only appear when you are in the 'Manage Segments' screen, not in 'Segment Summary'.