[FR] instal wifi, but marlin problem

[APrallydriver]

Good morning,
I need help with a firmware.
A while ago, I downloaded and installed your firmware on my Anycubic i 3 Mega S. Everything was perfect, I was very happy. Now I would have liked to install Wi-Fi with the ESP-01 following your guide, but I'm having some problems.
I'll start by saying that I'm not very familiar with boards and the software part. Last time, I followed your guide step by step and everything went well, but this time I'm having some problems I can't solve.
The hardware installation part wasn't a problem.
The part about modifying the Marlin firmware, where you have to comment out "baud rate" and "serial port," was, because I'm unable to modify and reload the firmware. When I try to verify and upload it, a series of red errors appear in the Arduino IDE window below.
I'm sorry, but I can't go any further. Can you help me?
My printer has the following features:

• Anycubic i3 mega S
• Custom carriage with direct extruder
• Bltouch
• TMC 2208
  Thank you for your help.
  And congratulations again on your work.

[APrallydriver]

would it be possible to have a custom firmware with only the options I need for my i3 mega S?