Social apps use special markup from the webpages to identify preview images, titles and descriptions when a link is shared. Member App allows you to customize these parameters.
Select the Membership that you would like to edit:
Click on three dots to open secondary dropdown and select 'Edit membership'.
Once you've done that you'll see 'Branding'. Scroll down the page until you see the 'Share course link preview' section.
Click on 'Upload preview image' to open the browse dialog for selecting an image from your local computer.
Select your preview image and click Open.
Fill the Title and Description fields to be used when sharing.
Click 'Save' to store you changes on Member App servers.