Instagram is a social media platform that allows users to post and share photos and videos. The app has a feature called “Notifications.” When a user posts or shares a photo or video, Instagram sends an notification to the user’s phone. The notification may include an alert about the post, the time of the post, and other information. To delete an old notification on Instagram, first open the app and sign in. Then, select “Notifications.” In the Notifications section, select the notification you want to delete. To delete the notification, tap on it and then press Delete.