The easy way using netGo

Start netGo from K menu > internet

Add a new profile
Chose the network card you want to configure (most probably is eth0)
Enter IP the address, netmask, gateway and DNS.
Click OK to save the profile
Click GO to apply the settings of that profile

The Linux way using a command line

Login as root in the command line
Use this commands to first set the IP address and the netmask and then the default gateway:

Now we should set the address of the DNS server. To do this we have to add an entry with the DNS address in the /etc/resolv.conf file.


Remember that you have to add your own values. The ones I used are only for demonstration purposes.