The microphone plugs into the USB port at the top of the back of the console. The unfortunate part is that you need a controller to assign the microphone. That means if you only have 2 controllers, you can only use 2 of the instruments. I sort of see why (so you can assign the characters, etc) but that shouldn't have been a limitation to use the microhphone.
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Plug the mic into the USB ports on the console.
You plug the end of the wire on the microphone into the USB insert in the back of the Wii. It is located near the top, near the GCN memory card slots.
for guitar hero world tour you need to plug the USB Cord in the back of the wii then start singing
Open the back of the guitar, then plug the cord from the guitar into the back of the remote. Insert the remote into the guitar (I tend to put the bottom of the remote in first), then close it up.
Make sure the console is turned off first, then plug the microphone into the console's USB port. Then turn the game on and use a controller to navigate.