Hi there
You'll be testing a 9V circuit, so set the Multimeter to the nearest higher value, which looks to be 20V on your Multimeter.
I used the SMD J201's on my build, had to solder them to the adaptors myself, bit of a pain!!! First of all I would suggest (if you don't already) using SIPP sockets, so you can change transistors if need be. And along the same lines socket the R4 resistor, this is the 16K resistor and this is on the drain of Q1.
With the circuit together measure the input voltage to the circuit with your multimeter. Touch a Ground Pad or Grounded point with the Black probe and touch the V+ pad of the circuit with the Red Probe. In my case I had 9.27V. I always start unless specified otherwise to bias the drain at half the input voltage, which for me was around 4.6V.
The J201 adaptor is marked DSG for Drain,Gate and Source. So with your Black probe touching Ground, touch D (Drain) with your Red probe to give you your reading. In my case it was at 3.62V with the 16k resistor, so I needed to lower the resistor value. 13K got me 4.65V, which sounds great.