Service: Instagram is a social photo and video sharing service.
How To Delete An Account:
1. Log into the Instagram web site from a desktop computer or mobile browser.
2. Click the username in the top right and then select “Edit Profile.”
3. Click “I'd like to delete my account” in the bottom-right corner.
Note: If it’s connected through Facebook -- i.e. a Facebook account is used to login to Instagram -- you should delete the Instagram account before deleting the associated Facebook account.
Related Article: How To Close Online Accounts