By far the 'best' way of installing flashplayer is through the 'package manager'.
The way mentioned by Mad Penguin is the next 'best' way.
One last way is to put the libflashplayer.so file in your
~/.mozilla/plugins/directory...if there is no 'plugins' directory...create one.
Be aware that the
.mozilla directory is hidden so you will have to select show 'Hidden Fies'
to do this on the AA1:
1) Click on MyFiles, which opens a 'File Manager' window.
2) In the menu bar, select View->Hidden files, to show a tick in the box.
The
.mozilla directory will now be visible in your
home directory (~)
create a
plugins directory (if it doesn't exist) inside it, and drop libflashplayer.so into that, now restart firefox, and the flashplayer will work.
Also be aware this will 'only' install it for the current user, if you have the AA1 set up with multiple users you will have to do this for each users home directory.
One last thing...If you do have to create a plugins directory, make sure its all lower case.
unlike Windows, Linux IS case sensitive.
Or see here:
http://forum.linux.co.uk/index.php/topic,72.msg112.html#msg112