All live-streamed weekend Masses are available for viewing as a "Previously Recorded Mass" once the live stream has ended. Click on the blue highlighted "PLAYLIST" section to select which Mass you want to watch (the most recent Masses are at the top, scroll down to get less recent Masses). Click on the selected Mass.
Remember, to view the Mass full-screen, click on the expand icon in the bottom right corner of the player once the video starts.