I want start server l2j.I have a page server in DISKW. WebSite work on my localhost. How and where do I change the IP to show you are on the external IP.  ?

 

I am not quite sure what is your issue here,but i can tell you some of my thoughts.

 

If you plan to host your website from your home computer,you probably have dynamic ip address,so there is no ip address that you can use specifically to access your website,in this case you must use no-ip services.Search for a guide here on how to setup this no-ip service.

 

Secondly you must open port 80 tcp,on your firewall.