1. Open your iPhone settings.
2. Tap “Notifications,” then locate and tap Instagram within your list of apps.
3. Toggle on the option to “Allow Notifications.”
4. Toggle on other notification options as you see fit (for example, you have the option to have Instagram show up in your notification center or show up on your lock screen).
If you don’t see Instagram within your list of apps on the Notifications screen, your phone may not realize yet that it’s an app that sends notifications. Wait until Instagram sends a notification, and then try again.