Are you talking about getting a notification that you have received a private message or have you subscribed to something (which is alerting you)?
For the former, you would go to the
User Control Panel, under
Board Preferences > Edit Global Settings (linked for your convenience) and set
Notify me on new private messages: (halfway down) to
No.
For the latter, you would go to the
User Control Panel, under
Overview > Manage Subscriptions (also linked), check any subscriptions you do not want (or click
Mark All at the bottom right, under the list of topics), then click
Unwatch marked.
Let me know if you would like further assistance.
Regards,
david