You can delete and or replace any previously uploaded file in the guest login.
- Go to Admin > Guest login.
- Scroll to the bottom of the page to the section headed Files.
- Click Edit to the right of the file you want to delete.
On the next page you have the options to amend and delete the file.
- Click Delete.
- Click Ok to confirm the deletion of the file in the pop-up.

The page will refresh and the file will no longer be listed in the Files section.