You can change your default landing page in BuzzStream and your email notification settings for tasks and contact assignment by going to the 'My Info' page. To get to the 'My Info' page, click the gear icon in the bottom left-hand corner of BuzzStream.
Reminders and the 'Homepage' field are at the bottom of the page
Scroll down to the bottom of the page and click Save to finish.
Additionally, you can also change the time zone that BuzzStream uses for your account, as well as the date format.