How can I show more than 1 post per blog?

Hi,

How can I show more than 1 post (the default value) per network blog in the theme front page? I have noticed that this questions is asked many times from you and the answer is to modify some lines in custom-functions.php file. Can you give more detailed instructions what values I need to modify to show for example 2 recent post from each network blog.

BR,
Jari