your in luck as i installed apollon on my pc only 2 days ago, its really very easy.
goto
http://easyurpmi.zarb.org/ and set up the CONTRIB source for RPMS,
then setup the PLF source for RPMS
these will enable you to install hundreds of software titles right from your "INSTALL PACKAGES" program in mandrake 10.
you will be able to install apollon and get started!
if ur havin any troubles just post