I assume you purchased the CD's? Did they not have instructions with them? There should be an introductory track you can listen to that explains it, such as listening to Lifeflow 10 (I assume this is CD 1? I got the download version myself) first for about 1 month before moving onto the next.
You can just listen to them, but greatest benefit is gained when you meditate with them playing in the background. If you're not sure about meditation you can download the free "Discover Meditation" tracks from this website which teach it.
Lifeflow itself isn't a meditation, but a brain entrainment programme, though they are usually used together.
Hugs
Giles
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