If your domain forwarding — available only to Yahoo! Domains and Business Email customers — isn't working, type your web address in your browser's address field, then hold down the "Shift" key while clicking the "Refresh" or "Reload" button on your browser. This will ensure that you are seeing the most recent version of your web page and not a browser-cached version.
If this still doesn't work, it may be a natural delay. The propagation of updates to standard and masked forwarding may take up to 30 minutes. It may take longer, up to 24 hours, if you are changing from or forwarding to a Yahoo! hosted web site.
Note: If you moved your domain name from another domain name host to the Yahoo! service, please verify that your domain name has been successfully moved to the Yahoo! name servers. Any settings, including domain forwarding, will not be active until the redelegation process is complete.