To remove a tag from one or more devices, do the following:
In the Devices page, mark the checkboxes next to the relevant devices. You can also choose to mark all the devices displayed at once.
Click Edit Details.
In Edit Details, mark Edit Tags. In the Remove field, choose the name of one or more tags from the dropdown list and apply your changes.
Delete a Tag
To delete a tag entirely, remove the tag from all devices with that tag. Once the tag is removed from the last device, it is deleted from the database.