In the menu on the left, under System Settings, click the Attachment Tags button.

 

 

On the page that opens, click the Add button at the top right.

 

After filling in the fields on the page that opens, click the Save button at the bottom right.

 

 

If you want to make changes to the file labels, click the Edit button.

 

 

To delete file tags, click the arrow next to the Edit button and click the Delete button.