http://www.nikonchat.com/remote-nikon-d3000/

How do I set my nikon d3000 with my remote?
I just got the Opteka RC-2 remote control for my Nikon D3000, but I'm not sure how work. The battery is in there, but no lights on and when you press the button, not taking a picture. Help?
I have the D3000 too. For the remote to work you need to change the release mode. I use the nikon ml-l3 remote with mine. Enter the menu, then on the icon of the camera. Then go to "release mode". Then select one of the remote settings. Or another way to change that without going into the menu by pressing at the bottom left of the camera, magnifying glass. Then on the screen, on the right side, there is a release mode to establish under the ISO setting. You can select a in remote settings there too.
Nikon D3000 on Universal Remote