This pattern uses just one crochet stitch - Treble Crochet (this is called a Double Crochet in the US ... as shown by the arrow above. It's sometimes easy to miss this last stitch, so watch out for it ...

I'll try to explain things as well as basic pattern-write. First off chain 4 and join to form a ring. The hole in the centre of the ring will be smallish, but this is where you need to work from for ...