In the Account menu button at the top of the site, tap on My Videos.
From your list of videos, select Download.
Choose your file quality.
Tap the download icon, then select your file.
Watch your file and select the share icon to share or save your video.
*If you're having any trouble, make sure your software is up to date. Go to your Settings/General/Software Update. Make any updates available and try the process again.
Once your video is saved to your library, you can easily post it to apps like Instagram, Facebook, YouTube, Twitter, and more.