[sv1cec]

In functions_warning.php, there is a function called sendpm, you will recognize it, it says

function sendpm(......)

and it has some parameters in the parenthesis. You should rename that to whatever you like, sendpmaws is a good candidate. The tough part is then to find where the sendpm function was called from (Warn.php? functions_warning.php? I do not remember) and replace that string (sendpm) with "sendpmaws" or whatever you decide to call that function.

Or you can write to Inferno, and ask them for better instructions.