Adding Loops
Add loops using the symbols included in the Nassi-Shneiderman library. Stretch or shrink the symbol so the loop symbol fits into your table.
Stretch the loop ends to customize the symbol
Once the loop is the right size, select all three pieces (don't forget the middle white piece) and go to the Arrange menu and select Create Combination Object.
Combine the customized rectangles
Once the rectangles are combined, move the loop into place on your chart.
The chart with a new while-loop