If you're looking to contact Instagram support or speak to a real person regarding an issue,1-877-592-0410 you can follow these general steps. Keep in mind that Instagram's support options may change, so it's a good idea to check their official support pages for the most up-to-date information.
Open the Instagram app on your mobile device.
Go to your profile and tap on the three horizontal lines in the top right corner to open the menu.
Select "Settings" at the bottom.

Instant Messenger: https://groups.google.com/g/microsoft.public.sharepoint.windowsservices/c/lDS26RbcMxg