You can edit the destination or a subdomain — or delete it altogether — anytime from your Domain Control Panel.
Visit your Business Control Panel. (If you have not yet signed in with your Yahoo! ID and password, you'll be prompted to do so here.)
Click the "Domain Control Panel" link under your domain name.
If you have a Web Hosting or Merchant Solutions plan, click the "Manage Subdomains" or "Manage Domain and Subdomains" link. If you have a Domains or Business Email plan and have set up domain forwarding, click the "Manage Your Domain Forward" link.
Click the "Edit" link that corresponds with the subdomain you wish to edit.
In the "Forward to" field, choose the destination of your subdomain — the directory with which your subdomain will be associated — from the pull-down menu provided. If you have a Domains or Business Email plan, you see the subdirectories of the site to which you are forwarding your domain. If you have a Web Hosting or Merchant Solutions plan, you'll see subdirectories associated with the site you're currently managing.
Click the "Submit" button.
You'll see a confirmation message and summary of your subdomain details. Click the "Return to Domain Forward Page" or "Return to Manage Subdomains" button.
Visit your Business Control Panel. (If you have not yet signed in with your Yahoo! ID and password, you'll be prompted to do so here.)
Click the "Domain Control Panel" link under your domain name.
If you have a Web Hosting or Merchant Solutions plan, click the "Manage Subdomains" or "Manage Domain and Subdomains" link. If you have a Domains or Business Email plan and have set up domain forwarding, click the "Manage Your Domain Forward" link.
Click the "Delete" link that corresponds with the subdomain you wish to edit.
Confirm that you want to delete this subdomain by clicking the "Delete Subdomain" button.