I just received my MX1000 and am setting up pages, etc on my computer. Can anyone help with these questions?

1. How can buttons you do not need be removed from the main page?
2. How can pages you do not need be removed from main page buttons?
3. Can someone explain "registering" buttons? What buttons must be registered? Why? What, in general, is registering all about?

Thanks in advance for the use of your knowledge.

Carl