How do I apply a BP Patch?

Hi guys,
I've been sent a BP patch to apply cleanly to BP 1.2.3

Stupid question, but how do I apply it? It's been submittted to TRAC and when I click on it there I can see the code.
It can be found here and changes the order of forum posts.

http://trac.buddypress.org/ticket/2354

Any help would be great,
Thanks Ross :slight_smile: