I had to google that brand, but it's sold as a gassless fluxcore welder so it's probably set up for DCEN from factory.
Easy to check if you have a multimeter.
Yes, it is indeed gasless-only, and therefore DCEN.
No easy way to change that, since this welder is one of those weird new ones which have a non-Euro detachable torch that feeds wire via a hollow Dinse plug, and that Dinse socket is negative on the front panel.