To view tasks for a specific tag choose Tags from the left side menu.

Tap the tag you'd like to view.

You can also choose how the tasks are grouped and sorted in this view.

To edit a tag long-tap the tag and choose Edit from the popup menu.

Make the desired changes and tap Save save the changes.

To add a new tag choose Add Tag from the menu.

To delete a tag long-tap the tag and choose Delete from the popup menu.