Remove activity, profile, groups etc. links in the header of the Social theme

Hi,

I want to remove the activity, profile, messages etc. links in the header of the Social theme (shown when logged in next to the "Welcome ...."); can you please tell me where to locate the code and what lines I need to remove to do this? I would still like the welcome message to appear though if possible, if not possible does not matter.

Cheers,

Isaac
http://trekkingasia.com.au/

P.S. Might also have a question about removing the left side widget area in the BP profile pages, if you could also answer this it would be a great help.