Each share button is configured to share a link back to your Instant Website. Visitors to your website will have the option to share it with their network on Facebook, Twitter, Pinterest, or LinkedIn. 

You don't need to configure or edit anything. Each option contains a pre-defined message along with your specific Instant Website link. When a site visitor clicks on any of those options, a share window opens pertaining to the platform that was selected (e.g. a Twitter share box opens if the Twitter share button was clicked). The visitor can then edit the message to their liking before submitting it to their social feed.