- Double-click on the Output icon, to open the Output Properties dialogue box. 
 - Click on the 
 next to the variables box. 
 - Double-click on the word 'sum' to insert it in the variable box. 
 - You are now back on the Output Properties box.
 
Change the port used to 'PORTD'.
-  Click on OK to close the Output Properties box.
 - The flowchart should now look like this: