Your group's subdomain is the one you chose to access your account when you signed up with investapp. If you don't remember, it's probably in your welcome email.
With Investapp.com, your group members can instantly share their thoughts on the stock market, track the thoughts of fellow members, and search by ticker symbol on their way to becoming more successful investors.

Investapp uses a twitter-like approach to messaging. Using one message box, members give timely updates with their thoughts on a stock.

Type a stock symbol like GOOG with a dollar sign - $GOOG - and Investapp will automatically append that message to the $GOOG symbol history page.

Your comments are automatically embedded onto historic stock charts. Find out if your timing was late, too far ahead, or perfect.

Track comments made by group members. Each member has their own page with a history of their comments.

Search through comments on the page, quickly navigate between hotly discussed ticker symbols, and more.

Add custom avatars, set the timezone, and more. Administrators can override this information as necessary.
Investapp is the best stock software I have seen for sharing thoughts on the stock market as a team. They just need an iPhone app.
— Nashville, TennesseeI absolutely love the way Investapp charts my comments on a stock to its actual performance. I am starting to time my buys much better.
— San Diego, CaliforniaI use Investapp solely for myself. I am not part of a team. That is how useful I find the auto-categorization by $ticker, the historical comments, and the handy charting.
— New Haven, Connecticut