To order, first click on your pot and then select your chosen fragrance from the second listing. Add to basket and repeat for each refill if you are ordering more than one. (Eg. selecting your pot and then selecting, say, 3 fragrances, will still only add one refill to your basket. You need to add each pot together with its fragrance individually) Candle pots need to be dropped into the workshop or handed over at a market if this is easier, likewise collection.
alternatively, just use this as a guide for prices and pay when you drop off, whatever’s easiest for you.