If you have a secondary domain name and you'd like it to forward to your PhotoBiz account, the best way to do this is to set up a 301 Redirect through your domain registrar. Make sure to set it up as forwarding without masking.
If you don't know how to do this, your domain registrar should be able to help you.
Note: If your registrar does not permit URL or Domain Forwarding, or is unable to assist you in setting it up you can contact Support for further assistance. You can place a ticket through your PhotoBiz account, or contact us by phone.