Find out your IP address
From MEPIS Documentation Wiki
To find out your computer IP address you can click on this link: whatismyip.org
However, this address might be the address of your router (if your computer is behind one) not the address of the computer, to find the local address of the computer you need to run this command as root:
ifconfig, look for the "inet addr:" for the interface that you use for connecting to the Internet (usually, eth0 for Ethernet port, eth1 or wlan0 for WiFi, ath0 for Atheros wireless card and so on).