1.) Click on the white "Calendar" icon in the middle of the Navigation Menu:


2.) Scroll past your calendar until you see the table of "Calendar Items":


3.) Use the "Search" filter to locate your task:



4.) Click on the specific task that you are planning to associate with an existing requirement and it will open in a new window just above the "Calendar Items" section. Click the "Edit" button in the bottom left:


5.) Use the "Requirement" drop down menu to select the requirement you would like to associate with this task:


6.) Make sure to click “Save” before exiting the page.