Need to change where yum's default channel to grab certain software such as mysql

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http://forums.fedoraforum.org – I am getting an error message stating "retry grab failed for http://fedora.redhat.com/releases/fe...rs/header.info I am using fedora 14 per request from my boss and this is what I get when I try to install MySQL using yum install mysql mysql-server. I am logged in as root. is there anyway I change the channel or site where yum goes to grab certain software packages such as the latest mysql from the site above. it looks like it does not exist anymore. Thanks I am knew to fedora. Mostly work on winblows machines. I need to change the repository of where yum looks to install certain softw (HowTos)