Excluding Categories: BP Daily theme

I found this post which is rather long: https://premium.wpmudev.org/forums/topic/how-to-choose-which-categtories-display-in-bp-daily-header#post-33872

And saw Tammie ask someone else to rather make a new post.

I would like to know whether the process to exclude (or even show only) categories is still the same with WP3 and BP and whether you find the ID of the category in the same way?