[CentOS-devel] What's the ftp password??

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