Warning!
I don't read Chinese, this is only my educated guess, but being an engineer, I would connect it according to the below guess.
The PSU is PWM controlled 0-110DC out. To adjust the output voltage you need a potentiometer or a signal. This PSU seems to have two inputs, apart from the potentiometer. These are 0-5V and 0-10V. I would connect it according to my guess and measure the output voltage using a DVM before connecting it finally to the motor. Beware, there should be a protective earth terminal as well, so my guess is that the two without screws are the earth. Check with an instrument if these are what I think they are. Measure between the two that there is zero ohms resistance there and than measure between one of those and the metal frame, which I guess is metal, not plastic. If the metal fram also shows zero ohms than those two are the earth and connect one to your wall plug earth, the other to your motor frame.
Please note, everything you do, you do in your own risk. I don't read or understand the slightest Chinese. I take no responsibility at all, the seller should provide you with necessary information. Personally I would not buy from such seller and would definitely demand my money back, or at least a reasonable compensation, like 50% refund.
Good luck.