Email notification regarding Login & Register can be found in WP Dashboard -> Autohub -> Settings -> Registration. These emails have been added on this tab due to them being conditional based on the user approval.
All other emails can be found in WP Dashboard -> Autohub -> Settings -> Emails where you will be able to enable/disable them as well as change their content that will be sent to the user.
You will only be able to edit emails sent from the theme from here and not from any other third party plugin