The Motors Tab defines motor directions, sets microstepping and steps per mm, motor currents, speed, acceleration, and jerk,

Configure the motors page as follows:

X: Backwards, x16 (on), 80, 10, 150, 500, 800, 0 (X)

Y: Backwards, x16 (on), 80, 10, 150, 500, 800, 1 (Y)

Z: Forwards, x16 (on), 400, 1, 10, 120, 800, 2 (Z)

E: Backwards, x16 (on), 93, 5, 100, 5000, 900, 3 (E0)

These values are found in the Marlin Configuration.h. Note that some slight changes have been made to bring it more in line with standard RepRapFirmware values.

Note that the Extruder microsteps have been set to x128 in the image. this is to increase the resolution of the extruder drive, which is rather low due to being an ungeared direct drive extruder. This is optional. The default x16 value also works and leads to a steps per mm value of ~96. Exact value to be calibrated later.