I've been reading about AA lately, and this is the most common advice. Just go up to her and say hi.

Well, how should this be said? I rarely see any follow up. I know it's supposed to be simple and just to get my feet wet, but can I have some more solid advice?

Do I just say hi and continue walking? Say hi and stop with a smile? After I say it, do I just say whatever? Just kind of confused.