erhmmm. most common way is “Gerðu það” like in the video, but with different accents (the ones in the video) it means do it
difference in pronouncation
Gerðuða = Do it
Geerðu það = Please
although it is written in the same way, so that comment in the bottom is most likely made by a very young person, who doesn’t know english that well or hasn’t properly thought the thing she just wrote down through 😀