You'd generally plug the miner into a router you can administrate and pick the IP off that if DHCP is enabled.
I don't have access to a router I can administrate here.
Go here and read from the beginning, it should get you going:
https://bitcointalk.org/index.php?topic=344970.0Do a hard reset first as you may have messed up some of the settings...
Good luck!
Edit: P.S. just disable ntp client if it's a problem.
That's the guide I was using. And I tried pressing the reset button. Is there another way to do a hard reset?