Overwiew
As a site admin, you can allow users to delete their user account. This action however, requires Administrator action, because in Joomla environment, only the site admin can delete user completely. Joomla! dont have the Front end facilities to allow such action, therefore when user delete account, it is actually only blocked, waiting for admin to complete the deletion process.
Enabling the option
Navigate to the site backend and from Components dropdown menu select JomSocial then Configuration
Under Site pane, you will see the settings regarding registration. and in it, Allow Profile Deletion option, which is enabled by default
