What build number are you on? If you are on 10.1 final, you should be seeing your Hosted Services on that page. I remember that at pre-release, you needed to do an extra step- When you click the Sign In button, click Manage Connections in the bottom of the window. You then need to copy and paste the URL to your organizational account from arcgis.com. Save this, then sign in, then you should be able to use "My Hosted Services." This should be automatic at 10.1 final.