Yes, once you have submitted your business listing you can edit it. Even if it is still in pending status. You can access your business listing from your profile page USER > DASHBOARD > LISTINGS At the My Listings page click on edit next to the business listing you wish to edit.
You can change images, add videos, and even change your social media profiles.
Once you are happy with the changes click save and your done.
Once the business listing is reviewed by a staff Admin it will be approved and the listing will be live on the Mighty Directory.