To add an Instagram post to your collection you'll first need to find the link to the post.
Find the link on desktop
- Click on the date of the post. If it's a recent post this will be something like '10 hours ago'.
- The post will open on its own, and the address of this page will be the link that you need to paste into your collection, e.g. https://www.instagram.com/p/BjWubG-Al_5/?hl=en&taken-by=adamtots
Find the Link on Mobile
- Click the '...' button on the post
- Click 'Copy Link'.
If you're specifically adding on iPhone, here's a video to help: