Instagram does not offer a feature to delete a single photo from a carousel or multiple photos within a single post. However, you could delete the entire post, including all the photos in it, and then repost the ones you want to keep. Here's how you can do that:
1. Open the Instagram app on your mobile device.
2. Go to your profile by tapping on your profile picture in the bottom right corner.
3. Find the post with the multiple photos you want to edit.
4. Tap on the three dots (...) in the top right corner of the post.
5. Select "Delete" to remove the entire post.
6. If you want to keep some of the photos from that post, you can create a new post by selecting the photos you want to include in a new carousel post or separate individual posts.
Please note that Instagram's features and functionality may change over time, so it's a good idea to check the latest Instagram app for any updates or new features related to editing or deleting individual photos from a post.