Hi Stephanie,
1. You can edit footer in Appearance > Widgets > Footer#1
2. On mobile device the video background can’t auto play because OS developers intentionally disabled autoplay on mobile devices in order to protect user’s bandwidth. Many data providers charge based on the amount of data consumed, so the OS developers decided it was in the best interest of the user to not have a video automatically begin playing when the page loaded so it would not start racking up data charges. Instead mobile web videos require the user to click them to start.
You can change it to image.
Regards
Harry
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