Thank you, will keep this in the archives for any future needs.
1. Go to Maintenance->Access Controls->Services; under Remote Access Control section, enable HTTP service, BUT change the port to what ever temp number such as 7777.
2. Go back to Advanced->IP Forwarding; and now you can add HTTP Server with port 80. Click save/apply button to save it.
3. Now go back to Maintenance page. the Remote Access Control Http service port auto change to 8080.
Thank you for sharing and enjoy.