[CentOS] what's the ftp password?

Fri Jan 22 16:11:36 UTC 2010
JudahXIII <judahxiii at gmail.com>

Hi all:
 i installed php, apache, mysql on my CentOS.
 then i installed wordpress on localhost.
 when i upgraded a plugin, wordpress asked me to enter "hostname",
"username" and "password".
what's them? i tried mysql username and password, they didn't work.
 anyone can help me? thanks so much.

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                      Yours JudahXIII