In general, you'll need to assign separate IP addresses (in the same subnet -- making one one more than the other should be fine) to both your computer and to the empeg (preferably in one of the 10.x.x.x, 172.16-31.x.x, or 192.168.x.x ranges). On the empeg, this can be done via emplode over either Serial or USB. As to your computer, it depends on your OS. So if you need help with that, let us know what you're running.

In addition, you'll either need to connect both the empeg and the computer to a hub or switch using normal ethernet cables or you'll need to connect the two directly using a crossover ethernet cable.

After getting those things set up, you should be good to go.