Customizing BuddyPress user profiles

(1) How do I customize the BP profile page (refer to profile.jpg)? I want to add a few fields in addition to "Name".
(2) How do I fix the profile settings view? (refer to profile_settings.jpg)
(3) How DO I control what is displayed in the main menu when logged in (refer to menu.jpg)?
For instance in my current setup, I want to remove Account, Account, Memberships & Register.

Thanks
Shireen