Row 4 is wrap and turn. Usually you would work back (purl in your case) to the beginning on the row but it seems that row 5 is telling you:
Row 5-8 is: work to wrap st, hide wrap, work 3 sts, w&t.
So for rows 5-8 you're working to the wrap stitch, hide the wrap and working 3sts more and turn. Don't work to the end for these rows, just to 3sts past the wrap st.
The easiest way to follow these directions is to take them step-by-step: wrap the stitch and turn. Then see what the directions are for the next row. Don't assume that you'll always be working back to the end of the row.
As for only working one side, read further along and see if you don't work the other side at some point in the instructions. It seems llike you have another ball of yarn still attached to work that side.