Hey happy dolphin, to check other's portfolio go to rankings then click on the name of the person who's portfolio you want to check.
Then just scroll down and you can see their current portfolio.
You can also click on history next to their name in rankings to see their trade history.
If that doesn't work.. then i'm not sure why. I'll try to get a screen cap if that's not specific enough.
Btw the options are really interesting. I'm still trying to understand them properly. But they seem very high risk/high reward and very fun, at least in the simulator. With a real portfolio, I'd probably be very leery of them.