With tagging you can organize items from multiple queues on the fly. Click on a tag to view all items that have that tag.
To tag an item first hover over the item and click the tag icon to show the tag line.
Click the + add tag button and either type a new tag name or choose an existing one.
The new tag will show up in the tag line of the item.
When creating new tasks you can also quickly add tags by using the pound (#) symbol and typing the tag name in the description (single word tags only).
Hover your mouse over any tag and a small X button will appear. Click the X to remove the tag from the item.
Click on any tag name and a queue will be displayed showing all items that have that tag.
To change a tag name you can click the Manage tags link or go to Settings directly.
In Settings you can update the name of any tag. All items with that tag will now have the new name.
In the Tags tab of Settings click the delete link for any tag you want to delete entirely.
This will delete the tag (it will no longer show up in the tag menu) and remove the tag from any items that were marked with it. Items with that tag will NOT be deleted though.