The process is exactly the same as if you were purchasing an item: click on ‘continue to payment’ and follow the usual steps. Obviously you will not be asked to provide payment details in the end, and therefore you will not be charged for anything.
This scarf is an easy classic with a little flavour. The pattern includes some good tips on scarf building, making this a superb first scarf for beginners, especially to practice your knits and purls.
Find more from this designer at: http://www.ravelry.com/people/bohoknits