welcome to goy
Is there a clutch pedal or just an accelerator /brake?

If not contact the place where you bought it from and ask for their help. Sorry best I can come up with.

Have a look here, you will have to scroll down quite a way to find the English language bit, then just print off those pages and ignore the rest.
https://www.libble.eu/efco-ef-72-c/online-manual-809942/