How to bias a tube amp with a Multimeter

I’ve had this Shuguang s8mk integrated sitting in storage for 6 years. I bought a multimeter to bias it. The meter is set up to mV. 
 

I’m getting zero read results. The amp has been warmed up for 90 minutes. 
 

It’s got a funky bias panel. 
 

What am I doing wrong?