by using Adobe's own YUM repository. This way you will get easy updates!
Install Adobe FLASH plugin
Download the rpm from http://get.adobe.com/flashplayer/otherversions/ and select Linux 64bit and flashplayer 11 for other linux (YUM)
Go to download folder (for the user that downloaded the files)
su - root cd /home/yourusername/Downloads rpm -ivh adobe-release-x86_64-1.0-1.noarch.rpm yum install flash-plugin
Restart your browser