When logging in how to redirect users to their store

Thank you for your quick reply.
The users should be redirected to their store when they log in.
Right now, they are being redirected to:
http://www.creativechinese.com/sarah/ - which looks like the Dashboard for a user - Sarah, and not their store.
Any ideas of what I am doing wrong?
Thank you,
Shaz
http://www.creativechinese.com