To access the notifications settings go to Settings > Notifications:
These are the general notification settings:
Enable email notifications - this is where you can turn off ALL email notifications.
Show user notification settings - this is where you can choose to show user notification settings.
For each item you can choose to notify, not to notify, or let the users choose their own preference:
To view the email message that will be sent click the arrow at the end of the line:
To edit the email message click the edit (pencil) icon:
Make your changes then click save:
Once you are happy with your changes, click save.