If you are trying to delete from your App. Go into Instagram settings
To keep backup all your data go to Settings -> Security – > Download Data and then provide the email address to get a link to the file with all your data.
Then go back and click on Help-> Help Center. it will open the following page
Or you can directly go to this link https://help.instagram.com/ if you are trying to delete from a computer.
Then select Managing Your Account -> Delete your Account
There is a link saying delete your account. Click on that and login to your account. Choose a reason why you want to delete the account. Re enter your password and click delete account.
If you want to see step by step guide, you can watch our youtube video as below:
If you want to directly go to the link to delete the account, here it is link.
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