To make edits to an existing shot, open the shot view and look for the edit icon near the 'Feedback' section.
Please note, you can edit the title, description, or tags on your shots, but you will not be able to update the image once it's uploaded. If you have a lot of views and likes, we'd suggest leaving the shot up. You're also welcome to Rebound the shot with the updated image.
In multi-shot, you cannot update the main image but will be able to edit all other images in the post.