Nginx server reached max_children setting problem

Hello,

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I see this error in log file

Code:

[04-Jan-2015 09:28:23] WARNING: [pool www] server reached max_children setting (5), consider raising it

I searching on the internet in order to increase max_children setting. But I can't find where to edit in Centmin Mod.
And sometime I met 502 Bad Gateway nginx and log say

Code:

[03-Jan-2015 23:46:58] WARNING: [pool www] child 5511 exited on signal 9 (SIGKILL) after 32.830814 seconds from start

How can I decrease the 502 error?

Thankyou!