On your Linux box, go here: http://get.adobe.com/flashplayer/
It should detect that you are using Linux. From the dropdown box that says "Select version to download..", select ".tar.gz for other Linux" and download the file.
I will assume that it will download to "/home/locator/Downloads/install_flash_player_11_linux.i386.tar.gz" (adjust as necessary
Now open a root terminal and enter commands:
tar zxvf /home/locator/Downloads/install_flash_player_11_linux.i386.tar.gz -C /tmp
cp /tmp/libflashplayer.so /usr/lib/mozilla/plugins/
Hint: Learn to use auto-complete. To change to /home/locator/Downloads, type:
"cd /ho" (press Tab and watch it auto-complete), type "lo" (press Tab again", type "Dow" (press Tab).