Some basic steps to configure a switch port

First of all, you should figure out in which vlan you want to put the port (host). You can have a nice overview of the vlans with following command:

show vlan

To change the port settings, you can use following commands.
Go into the proper port:

conf t (configure terminal)
int fa 0/3 (interface fastethernet 0/3)
speed 100
dupflex full
sw ac vl 1 (switchport access vlan 1)
Description fehostname

For a CATOS, this is a little bit different:

set port speed 4/6 1000
set port duplex 4/6 full
set port name 4/6 hostname