Step 1: Select the tasks you would like to add tag(s) to by clicking the checkbox to the left of the tasks
Step 2: Once you've selected the necessary tasks, click the 'Change Tags' button to select the tag(s) for your tasks
Step 3: Confirm your decision to add the tag(s)
Step 4: You will be notified that your action is complete in the notification center. If you click on the notification, you will be directed back to the tasks.