Logic...
Enter the turns for the pattern. "R"s for (R)ight turns and "L"s for (L)eft turns. Then press the Logic button to set your selection.

Cycle...
Enter the number (1-4) of cycles for the pattern to repeat . Then press the Cycle button to set your selection.

Try This...
To see how the parameters work, change the Logic parameter to be a single "R". Leave the Length and Cycle parameters set at 4. Press the Draw button again.

This time a simple square is drawn. The square has sides the length of 4 pixels, a logical pattern of a single right turn and it repeats the cycle 4 times.

Get it?