In order to access your Domain page, you need to click on Manage Domains link under Build your website option provided at the main page of your Microsoft Office Live Small Business account.
If it still did not help, then you should post your concern on http://ask.officelive.com/smallbusiness/, as this forum is for questions related to Microsoft Office Live Workspace subscription.
This will not only help you in getting the appropriate information but it will also help other users in Microsoft Office Live Small Business Community who are looking for resolution for same query or would like to provide you better replies as per your need.
Good luck!
Sunil
Sunil Raina
Microsoft Support Engineer