How do you share someone's Myday?
Select 'My Day' to share the photo or video to your Messenger story. Tap the cog wheel button next to My Day to customize who can see your story. You can allow all your friends to see your story and exclude a few, or you can select just a few friends to make your story visible to.
How do you share in messenger?
As with other share extensions, open the share menu in an app, then scroll to the More option, select it, and switch Messenger sharing on. When you choose to share a photo, video, or link with Messenger, you'll see a window that lets you add a caption and choose the recipients of your messages.