Move the slider at the top to view transitions. To enter edit mode, check "display edit nodes". Once in edit mode, you can drag the coloured dots on the page around to form new patterns (use the CTRL key to select and move multiple points at once). A new pattern can then replace a current pattern, inserted at any point of the routine, or simply be added to the end. Current patterns can also be deleted (first click "Move edit nodes to current (grey) pattern" if the option to delete is not available).
Suggestions for improvements and features etc are welcome!