Re: Deleting a certain part of the navigation
are you trying to disable blogs completely?
or just remove the menu option?
to disable blogs completely:
rename bp-blogs.php and /bp-blogs/
i.e. “bp-blogs.phpDISABLED”
that will remove all menu links to blogs, you’d also want to change registrations to users only and not allow blog registrations.
to remove that menu option from just the profile page, your looking at some core edits, or possibly adding something to bp-custom.php to remove the link from the profile screen.
I forget off hand how to do this. I’ll re-post once I remember 
