how to fix container configuration for C code

Question

I'm newbie in computer science.

I have only studied C language with Visual Studio.

I want to study C language using codeanywhere Because for

personal reasons nothing can be downloaded to my computer.

So, I sign up codeanywhere and make container but when I

run C code, I got some error.

The error is "Run configuration not defined! Please open Container config and define your run configuration."

This is what I do in codeanywhere

I made Container with C stack

create file "hello.c"

this is code and run

and this is error display

this is container configuration

I don't know how to fix this container configuration.

Please answer about that

thank you