Marriage is a qualifying life event allowing you to add your spouse to your benefits. You only have 31 days from the date of the event (date of marriage) and will need to provide proof (copy of your Marriage Certificate) including the date of marriage.
 
To add your spouse, go to Workday / BenefitsChange / Benefits. For Benefit Event Type, select Marriage. For the Benefit Event Date list the date of your marriage. Scan and upload the document by clicking on the circle next to Attachment. 
 

Then you will have a task in your inbox in Workday to complete.