To permanently delete your Instagram account, follow these steps:
1. Log into your account on a mobile browser or computer. You can’t delete your account from within the Instagram app
2. Go to the Delete Your Account page, which you’ll find here
3. Enter the drop-down menu next to ‘Why are you deleting your account?’ and choose an option
4. Re-enter your password when prompted
5. Click or tap ‘Permanently delete my account'