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
This will allow the users to have additional option in the edit profile field, to delete their user account.
Deleting Account
The action must be initiated and confirmed by user itself by clicking on the option displayed in above picture, and then confirming the deletion by clicking on the Yes delete my profile
After clicking on the Yes, delete my profile the user will be automatically blocked (not deleted) and logged out from site with no ability to login back again.
The email will be sent to site admin, notifying them about user request to delete profile.