Registration After Logging Out Not Possible

say if you are logged into your own blog and then you log out, wordpress gives you the usual page (form) with the fields to enter username and password along with the wordpress logo at top (unless one has changed it to their own custom logo). With the buddypress social theme activated on the main site, the register link takes you to the default wpmu registration link rather than the buddypress registration link.
So could someone give the code required, with the specification as to which file to be edited to get the "Register" link point to the buddypress registration form.
Actually just checked as I typed that even on the "Lost your password" Form the Register link has the same problem.