|Sounds like you need to hire someone.|
To access a web page you need to translate the name grupocenca.com to an IP address. There are few ways to do that. Hopefully that name is what is called a registered or FQDN. If it is registered then the who registered you ought to have a way to point that name to your external IP address. To access it locally might be different. The process is called DNS. To check it you use the command line nslookup www.grupocenca.com and see what happens.
Playing to the angels
Les Paul (1915-2009)