Yes, you can edit your Instagram post after it has been published. To edit a post, tap on the three-dot menu icon (•••) located at the top right corner of the post, and then select 'Edit'. You can change the caption, add or remove location information, and tag or untag people in the post. However, you cannot edit the actual photo or video content. To change the visual content, you will need to delete the post and upload a new one with the desired edits.