BP Corporate Theme (signup button)

Hi,
I am working with the BuddyPress Corporate Theme to create a single site paid membership site.

My question is:-
can anybody suggest how I can remove the sign-up button that sits with in the top bar that contains search, login and sign up. See screenshot.
The reason being is that I am building a paid membership site. My Join now button takes me to the paid membership area, the signup button I want to remove takes me to the regular wordpress sign-up area missing the payment opportunity.
Alternatively is there a way that I can change the destination of the sign-up button.
Any suggestions of guidance warmly received.
Many thanks

Andrew