Updating Title Tags in BuddyPress

When someone signs up for a profile on our domain, and then adds pages and posts etc., the title tags on the pages are not changing.

For example, our site is at 4.biz, we have set up a profile with the name 'Key Signs', which means that their domain is keysigns.4.biz - however, when we add new pages and posts on that domain, the title tag throughout their site is '4.biz | Home' - I cannot see how to change these in the admin section, is there a way to update these?

Thanks.