To dial it in you need to set it for remote,then put the foot control/hand remote on it. Set the amperage on the machine for what you want your maximum current to be. For 1/16 steel I would set it for 75 -100 amps max. You dont want too much heat input, so you can't go real slow. The slower you travel ,the less heat you should use. When you start AC welding aluminum it will be "hot n fast"

I never heard of that brand of welding machine,but their web page looks alot like Millers web . The only thing I don't like about it is the knobs sticking out like that,my Lincoln invertec is like that and all the old thermalarcs used to be like that. They always get damaged by getting banged into somethin or something fell against it. If the potentiometers are on a board it's costly too. So be very careful when moving it around! Not saying it's a bad machine or anything ,just passin on 30 yrs Marine/shipyard welding experience.
Don't ya just love building your own stuff! PS always keep fire extinguisher HANDY .