Present the tag you want to unassign to the Tag reader. You will see to whom the tag is assigned and be able to see the user overview. Additionally, you are able to assign the tag to a ‘New User’ or an ‘Existing User’. 

If the tag is a ‘Master Key’, you will first have to unassign the tag as a Master Key before you can unassign the tag from your Site. Click here for instructions on unassigning a ‘Master Key’.