Installation procedure not working

[hkalle]

If I follow the installation procedure I am getting the message:

$go get -u github.com/Abc-Arbitrage/infix/command
go: go.mod file not found in current directory or any parent directory.
'go get' is no longer supported outside a module.
To build and install a command, use 'go install' with a version,
like 'go install example.com/cmd@latest'
For more information, see https://golang.org/doc/go-get-install-deprecation
or run 'go help get' or 'go help install'.

I could manage to install infix with the command

$go install github.com/Abc-Arbitrage/infix/command@latest

But then I am stuck with the next steps. Could you please advise?

Thanks upfront.