To view past Masses, click in the 'Livestreaming Mass' video box. In the upper right corner, you will see the Event Posts icon (shown below). Click on it and a list of past Masses will be listed. Choose the one you want to watch then click the 'Play' button. The same can be done for other archived Livestream events.
You can also click the hyperlink embedded in the 'Holy Family Parish, Pittsburgh' label found in each Livestream video box to get to previous videos..