How to add blogs?

This is probably a dumb question but how do I add an option for my members to add a blog on my website? There is already the built in Buddypress forum feature, but I am coming from Ning where they had an option to use either the forum or a blog to express themselves.

Also, an ideas of how to make the forum easily accessible? Right now with The Social Theme it is bundled into the "Community" drop down menu. Also, how do I make it the first page one sees when logging in? Right now it is set to a general activity stream. Ideally I'd like to recreate a Ning type environment where right when you login you can see the activity stream on the side--more as an information feature rather than the main thing, with the forum and blogs as the main part of the screen.

I hope that makes sense. Thanks.