It’s becoming a bit of a theme with this book that I don’t clearly understand the instructions. Whether that’s me or the book I couldn’t say.
Round 4 instructs “1dtr into each of next 2 missed dc 3 rows below,”. The part I found confusing was whether to construct these 2dc in the front of the 2 rows above them or to work the dtr around these rows. I tried it both ways and concluded that they must be constructed in front of the proceeding rows. In this way the back is different to the front of the square. When I constructed them around the preceding rows the two sides were the same but the work was bulky and misshapen.
I recommend that you try both ways for yourself and decide which methods suits you best. The pattern can be found in”200 Crochet blocks for blankets, throws and afghans” by Jan Eaton on page 79.