Step 5: Attach the Magnets
The best thing you can do here is to look at the diagram in the PDF from a few steps back. Basically, you need to attach the magnets (glue, tape, epoxy, whatever works) to the CDs in such a way that the poles alternate. A magnet that faces north follows one facing south follow one facing north, etc. If you're confused, do check the diagram. Marking the poles with a Sharpie also really helps.