Where is the list of notifications?

In the top menu you can see the bell icon that leads to a shortlist of notifications; to see the whole list, click on the All Notifications link at the bottom of the list

How to change notifications?

To do this, go to the Settings section and in the Notification Settings section, you can change the notification settings. You have a choice 

•     Web and Email Notifications
•     Email Notifications
•     Web notifications
•     Notifications not needed