Which free dns service are you trying to use for this?
www.dlinkddns.com ?
host name is normally a mnemonic name that will uniquely identify your
public IP address (the address that the service provider "gives" to you either
statically or over DHCP).
In general it has to a be a unique name. So
home.dyndns.org is almost certainly
taken or unavailable. You should choose something more unique like:
robertobi or possibly add some numbers after the name you chose to make it unique.
I believe that the new IP address only needs to be filled when your "browser" address
is not the detected public address. It seems to me that the IP address you show in your response
is a public address so most likely you can ignore the new IP field.
Also note that unless your service provider assigns you a static IP address, you should setup
some dynamic DNS client behind or on your firewall. This is needed because the service provider
may change your IP address without warning. Some routers/firewall boxes support
dynamic DNS clients within them so you don't need torun it on a separate PC.
L.