How to change avatars?
In order to show a “Change Avatar” menu item in the [adverts_authors_manage] shortcode like in the image below you would need to:
First, download the Change Author Avatar extension then install it from wp-admin / Plugins / Add New / Upload panel and activate.
Next, you will need to go to wp-admin / Plugins / Add New panel and search for either “WP User Avatar” or “Basic User Avatars” extension and install and activate it.
While the WP User Avatar extension is more popular I recommend using Basic User Avatars since this is a really simple plugin that only allows selecting an avatar from the user computer and uploading it, the WP User Avatar additionally grants the users access to the Media Library which often might be not what you want.