Minecraft Xbox360 split-screen HALP?

I have a Hitachi HDTV and the old white Xbox360 it won't let me play split screen multiplayer on it I looked it up and it said to switch the switch from tv to HDTV and when I did that the picture disappeared and someone said something about the green, Blue and red cables but I don't know where to plug them in at because not things in the back to plug it into do I get the hdmi cable? If so where do I get that and where do I plug it in at I'm so confused >

The old white Xbox 360 does not have a HDMI port.

You can still get HD from this model using the HD-AV cable kit, which provides component video. This consists of 3 cables for the video signal (Red, Blue, Green) and 2 cables for stereo audio (Red, White) Yes, there are 2 red cables, don't confuse them or you won't get a picture.

On the back or side of your TV should be a clump of colored ports that are labeled Component Input. You'll match the colored cables to the colored ports - again, being careful not to confuse the red video cable and red audio cable.

Finally, you'll have to flip the switch on the cable adapter to "HD".