Instead of taking the 321 South Exit, stay on I-40 East. The Metro Center is located on the South (right) side of I-40 between the next two exits. Probably the easiest way is to take the second exit, make a right to the top of the hill, then make a right on Hwy 70. You will go thru 2 or 3 lights, the mall will be on your left, then make a right at the Verizon store and go down the hill to the back of the Metro Center. I-40 and Hwy 70 run parallel to each other, and the Metro Center is between them. Hope I haven't confused you too much.