To customize your profile simply do the following.
In the top right click on your current profile picture.
On the menu that drops down click the icon of a person.
Then click Preferences.
This will bring up the preferences page.
Select Profile from the menu on the left.
Here you can write a description, change your location and time zone, add a header, add background etc.
Select Emails from the menu on the left.
Here you can set preferences on when you want to be emailed.
Select Notifications from the menu on the left.
Here you can change preferences for what and when you receive notifications.
Select Interface from the menu on the left.
Here you can set language, text size, default home page, and other interface settings.