Can anyone tell me where the room is where I place the Artifacts?

It took me forever to figure this out, so here you go!!

Go into the temple. Walk north up to the statue again, but don't go on the platform. Go by the Western Flight Charge and take it. Walk to the West from where the Flight Charge was located. You will enter a secret passage. Keep on walking west, even when you come out of the passage. When you can't go West anymore, head south and take the orange platform. When you emerge from the platform, go a few steps East then to the south. Pass by the
green platform. Go a bit more to the East and take the Yellow platform. Go west from that platform as soon as you can. Go all the way to the West and take the final platform you see, the white one. Walk strait up into another white platform. And there you are! Walk up to the "x"'s on the floor and press A when right in front of them todrop the Artifacts. When you place the final one, you will hear something. Walk to the West to reveal that a new platform has appeared another white one. Take it.

Just keep on walking up. DO NOT take any other platforms you see. When you come out of the temple, you will see Krillin, Gohan, and Vegeta. Prepare to fight the Ginyu Force.

Hope this helped!