My responses are in GREEN 
Hi FurryNutz,
Everything is OK now. I deeply appreciate for your help.
May I have an other question.
Regarding the remote management the router outside my local network,
I have already enable the remote management on router and the DDNS is enable and connected. But I cannot access via http://xxxxxxxx.dlinkddns.com:8080 to remote my router.
Could you please give some advise to find out what is problem?