You can get a link to photos and videos that have been shared publicly. If an account is set to private, you won't be able to copy a link to any of their posts.
To get a link to a post in the app, tap above the post and then tap Copy Link. The link will be saved to your clipboard.
You can also get the link by viewing the post on the web. To get a URL from the web, open a browser and go to https://instagram.com/username (ex: if the username is "johnsmith," go to https://instagram.com/johnsmith). Click the post you want to get the link to and copy the link at the top of your browser.
Submit this link to Shoutcart link view if required.