You can search for them, if they are using the same name (and most of them are!) or you can try finding one of them through search (say, Poppet) and then using their profile to find all the others.
You can search for their Fluther user name. If you’re from the site I think you’re from then you can go to marissa‘s profile, she’s added a bunch of them to her Fluther and you can find them from there and add them to your own Fluther. Welcome and have fun!