Add a default cover image to a listing page

I think this may assist too:
https://wpgeodirectory.com/docs/core-design/#listings

Upload listing no image:

This option lets you upload an image to use for listings when no images are uploaded by the user.

You can also upload default images for each category to show if the listing has no images uploaded, and that default image from the category will take priority over the image uploaded at the settings on the listings page. Navigate to your categories to upload a default image there if that is what you prefer.

You can direct them to gravatar.com for that. Or you can use UsersWP. Without one of these, no. GeoDirectory doesn’t provide extra tool for user management.

Thanks

You need to add this snippet in your wp-config.php:

define('SD_DEFAULT_FEATURED_IMAGE', 'http://your image url here');

Thanks