If you need the static IP then you can edit the etc/network/interfaces file and add it there,something like this
Before
auto lo eth0
iface lo inet loopback
iface eth0 inet dynamic
After
auto lo eth0 iface lo inet loopback
iface eth0 inet static
address xxx.xxx.xxx.xxx(enter your ip here)
netmask xxx.xxx.xxx.xxx
gateway xxx.xxx.xxx.xxx(enter gateway ip here,usually the address of the router)