Hi @ikipac – Do you mean you want to turn them off here on BuddyPress.org? Or on your specific BuddyPress installation? And by ‘notifications’ do you mean the email notifications, or the messages shown under the blue number near the top-right of the screen?
Email preferences are on the Settings panel of a BP profile. Here on buddypress.org, that’s at https://buddypress.org/members/ikipac/settings/notifications/
The screen notifications (behind the blue number) can be turned off on your own BP installation by disabling the Notifications component (Dashboard > Settings > BuddyPress). It’s not possible to disable this feature on your buddypress.org account.