Question About Soft-as-a-Cloud Baby Afghan

[venom996]

Hey everyone!!
I was shown the basics of knitting 4 months ago and have been obsessed ever since... I LOVE TO KNIT... I have knitted, [b]5 hats, 3 blankets, a baby coat w/cap with homemade clay buttons, and a scarf!
Ok, this may seem like a stupid question but boy, am I confused on this easy pattern! lol
The free pattern is here: ravelry.com/patterns/library/soft-as-a-cloud-baby-afghan

The pattern has the Pattern Stitch instructions and to the right of the page, the Afghan (Beg Pat) instructions. Which one (or both/back & forth?) do I follow for the baby afghan in the photo? I see where I'm suppose to cast on 106 sts (w/2 strands) but confused as to where I go from there... the Beg Pattern or the Multiple of 20 sts (Pattern Stitch) wth...?
I would be so grateful for any help 'ya all can give me.
Thank you SO much!
~Shari