To balance a design panel you’ll want the ending top edge to match the beginning bottom edge. If they do not automatically match, you usually just have to add one plain mesh A-colored row of dcif or dcib to balance the design. However, sometimes you just have to experiment with the last row or two in order to complete a panel. For example the Castle Top design requires a little extra work.
After completing the 2 A-colored and B-colored rows to the length you want, return to the front side.
Drop B to the back
With A color work one row of dcib across.
With B color work one row of dcib across and drop B to the back.
Turn project around.
Work only one more A-colored row of dcib across.
You now have a balanced design and are ready to unite the edges.
If you need more instruction on how to execute the Interlocking Crochet technique, look at the written instructions and pictures on this website. Or I also have a video workshop demonstrating the technique and walking you through several of the designs at www.YouTube.com Tanis Galik Playlists.