Open the Instagram app on your phone or tablet. You will need to have an Instagram account to report another account.
Navigate to the profile of the account you want to report. You can do this by searching for the account using the search bar at the top of the screen,
Once you are on the account's profile page, tap the three dots in the top right corner of the screen. This will open a menu of options.
Tap "Report" from the menu that appears. This will bring up a new screen with a list of options for why you want to report the account.
Select the reason for reporting the account from the options provided. You can choose from options such as "Harassment," "Spam," "Fake account," or "Nudity or pornography."
Tap "Send" to send the report to Instagram. This will submit your report to Instagram for review.
Keep in mind that Instagram may not take action on every report, as they have to review each one individually to determine whether it violates their community guidelines.