Can I display photos from someone else’s Instagram account

Yep, you can display the photos from any Instagram account, so long as the Instagram account is public and not private. All you need is the User ID from the Instagram account, which you can find by entering the username into this tool.

Once you have the User ID then simply enter it into the User ID field on the plugin’s Settings page, or directly into the shortcode like so: [instagram-feed id=1234567]