New here saying hello and need help

Hello how is everyone? First off I would like to say thanks for accepting me as a new member. Im new to CNC machines and recently bought my first DIY kit on Amazon MYSWEETY DIY CNC 3018-PRO 3 Axis CNC Router Kit with 7000mW 7W Module + PCB Milling, Wood Carving Engraving Machine with Offline Control Board + ER11 and 5mm. I received the machine and it does what I want except it needed an upgrade on the y axis so I bought the extension kit to convert it to a 3040. However the new parts came with no instructions on what settings needed changing in the machine to reflect the new y axis travel adjustments. Now my question is this, does anyone or has anyone done an upgrade on the Y axis and if so what settings did you change?

Thanks in advance for any help because right now no matter what I change in the code it always goes to end and just faults out