You need to change the right needle to your left hand. The instructions you gave sound as if it's for a knitted cast on. After you do your cast on of 4 sts, put the needle back into your right hand and continue on across the row as instructed. Either there is a typo or I'm not adding right (entirely possible, even likely, or I'm just missing something) because starting out with 30 I come out with 38 sts to end the row, not 48.
Happiness is catching that dropped stitch while it's still fixable..