Top bar – BuddyPress

Hi,
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2 questions:
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1° Why does the option “Login” leads me to the WordPress Login page and the option “Registrar” leads me to area inside my site ? See this link:
https://ajudaroproximo.com.br/wp-content/uploads/2014/11/barra-wordpress.jpg

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2° How can I do to NOT to appear the following options selected in the link below?:
https://ajudaroproximo.com.br/wp-content/uploads/2014/11/barra-wordpress.jpg

I want to remove this cause I want the visitor, when he logs in, to have access only to the BuddyPress items that appear at the right side.

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I′ll be waiting for these information, please.

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Sincerly yours,
ícaro