If your system or platform administrator activated this , you have the possibility to create tags. In fact tags are organised like folders. 

|1|  To create a new tag, start creating a normal folder.

|2| In the creation form, right below the textfield "short title", you have the possibility to choose between folder and tag > click "tag" and then when you are ready with the rest of the form, publish.

|3| Next to the title in the structure you will now see a new symbol displayed: .