FCM Key is not set. Please tell me how to fill it.

[ITITIT123]

xx3FCM Key is not set. Xx3fcm key is not set

[remdex]

And how it has to do anything with Live Helper Chat

[ITITIT123]

Google firebase cloud message Do I need to apply on my own? Or do you use the system default?

[remdex]

You need to generate your own or follow and comment out temporary FCM related parts.
https://doc.livehelperchat.com/docs/mobile#how-to-compile

[ITITIT123]

I need to use your Google firebase cloud message is that OK, redevelop, I don't have the technology. I need to use yours

[ITITIT123]

Do not know how to compile, do not know how to compile, can teach how to modify the file

[remdex]

That's for you to learn all that, not me to teach... Refer to Flutter documentation