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The method is the same you shut off the valve below the hose drain then hook a hose onto the drain open the drain and put the feeder valve on fast fill. Turn off the boiler first. You let the water run for several minutes after the last of the bubble noise stops. Let me know if you have more questions.
You didn't understand my instructions apparently. It doesn't matter if the purge station is on the supply or return. The principle is the same and if you did what I instructed you can purge your system.
If you just followed my instructions you could have save yourself the cost of a plumber. Your assessment of water flow is incorrect. When you shut the ball valve off you force the water through the loop back up through the return and out the drain. If you want a refund contact customer service athttp://ww2.justanswer.com/contact-us