to go to your SS, just make your sims call for transportation and choose 'go to secret society'. Of course you can't clink on it cause once you put SS on the lot it will automatically vanish from sight cause that's what it's all about 'secret'. But if your intention was to redecorate it, well, I don't think that's possible... I dunno.

but to get there with the phone don't you already have to make freinds with 3 members?
they wear llama suits around the campus