There are a few different ways to find the metrodome click..
the 1st one is to look on your TRANSPORT bar and find the actual picture of the Metrodome in the circle below the fast foward... IF you click and hold this button it will bring you 2 options..
"RECORDING OPTIONS" and "LOCATE METRODOME CLICK"..
When you chose RECORDING OPTIONS it opens a menu box that gives you many options of how you want the CLICK to be - ie... Click while playing, Click while recording and so on
When you chose LOCATE METRODOME CLICK it opens your enviroment to show you what if any device is attatched to your MIDIclick ICON on the screen...There you may chose what key you would like the click to play and what channel you would like the device to play from..