lol
That's what I thought.
I think in English it means that if you open the config.php file in a text editor, half way down the file there are two lines:
$phpmailf = '';
// $phpmailf = 1;
I suspect that suggestion may be to take the // from the second line and put them in the first:
// $phpmailf = '';
$phpmailf = 1;
(Then of course you have to save as config.php again and put the file back where it came from.)
What the effect of this is, though, I have little idea.