You probably need to do something like this
except for your specific remote. Maybe contact the vendor if you need help, and let us know how to do it if you figure it out.
Also definitely try setting the PWM (“PPM”) pulselengths in the VESC Tool under App Settings > PPM > Mapping. Make sure you turn on RT APP on the right side first.
When you turn off the remote, the skate should coast. Anything else is dangerous.