Starting Duromax XP4400E is pretty easy: all you need to do is push the button and turn the key. Plus, the whole process is supposed to be described in detail in the manual, so it should not be a problem. But if you did find it difficult to start the generator, please, follow these instructions:
add oil into the crankcase;
add gasoline to the fuel tank;
ground the generator;
turn the fuel valve to the "On" position;
turn the choke lever to “Closed”;
check if the battery is charged;
turn the key into the “Start” position and then put it back into the “On” position;
turn the choke lever to “Opened”.