BuddyPress.org

I don’t know what you mean by “headline post and pages”? You’ll have to explain further.

Do you mean meta title = “..” ? In which case, I recommend installing “all in one seo” in your blog.

If you mean the h1, h2 tags, etc. on a page … then that will all be in your theme’s template files (header.php, single.php, page.php)