At the command line:
input :
wget -c http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player_9_linux.tar.gz
to get the flash player 9.
Then goto the home directory of yourself and decompress the install_flash_player_9_linux.tar.gz
input: tar -zxvf install_flash_player_9_linux.tar.gz
then , input : cd install_flash_player_9_linux
input: ./flashplayer-installer
Select Y and " Enter" when there have some notefiction. And at end when the install is completed it will show you "successfully complated!"