Heres a few moves to work the Trapezius - the muscles at the back of the neck. The Rock is well know for his mighty traps!!
Here we see Arnold performing the upright row movement on a smith machine. Pull the weight upwards with elbows high lower and repeat.
You can also perform the movement with a low pully and experiment with different angles - also use free weights see what works for you.
Some use a machine to perform this movement so dont be scared to ask for a demonstration from a trainer and do your research to get the proper form.