I would like to add the Year that each couple was Married, how do I include this information?

Answer 1

in the bottom of the page clik on "Show" and click activities for example and in the character that you want write the marriage date :)

Answer 2

If you click on a person, select the second tab in the sidebar which is 'Partners'. Then you can 'Edit partnership details', which includes the date and location they were married.