Dual controller: turn left and right

Hi everyone,

I'm using Flipsky FT60BD dual controller with my two-motor device (basically a wheelchair). I want the device to turn left and right when sending PPM signal from my joystick. Normally, if you want to turn right the left motor (wheel) moves forward while right motor (wheel) moves backwards (and vice versa). While I was able to get the motors move forward and backwards simultaneously I'm struggling to turn it left or right. Any help would be appreciated.

The device in question (FT60BD) is this: https://flipsky.net/products/ft60b d-dual-esc-60v-120a-with-heatsink?_pos=1&_psq=FT60BD&_ss=e&_v=1.0

I'm programming it with Flipsky ESC Tool.