How disable sent mail to email user when new topic, new comment

How disable sent mail to user when new topic, new comment?
Now, email notification when have a new topic, new comment to all user. Can i disable them or only sent mail to admin? Or can we turn off to a group user?
Thank you!

Hello! who can help me

I have this doubt too.

I am sorry but I am not sure what is being asked here?

Disable notifications of answered topics and month summary email

I just want the to send password exchange and new forum registration