From your 'My Hub' page (please see below)
On the left hand side of your account, you will see the side menu where you can select 'Settings'.
Click 'Features from the 3 options at the top of your page
And select 'Notifications' on the left-hand side
Which will then allow you to turn on/ off notifications and edit the frequency.
Remember to save by hitting the 'Update Notifications' button.