Step 1: Go to the Instagram profile you wanna delete and click on the menu back at the top-right corner.
Step 2: Select 'Settings and privacy' option.
Step 3: Now click on Accounts Centre.
Step 4: Select Personal details.
Step 5: Click on Account ownership and control.
Step 6: Now select 'Deactivation or deletion' option.
Step 7: Select which account you wanna deactivate or delete.
Step 8: Select Deactivate account.
Step 9: Now enter your account password.
Step 10: Select any reason from the list.
Step 11: Now confirm be clicking 'Deactivate Account'.
That's it you have successfully deactivated your Instagram account within one minute.