The rectangle get drawn in the upper left corner at selection.
Select rectangle to drag it to a new location.
Long press the rectangle to add text inside.
Do another rectangle and drag it to a new location.
Each rectangle are drawn with connecting point for a line to be draw.</br>
Select the line icon and pick near one of the connecting point on one rectangle</br>
than select the other rectangle connection point.
To entre a title for this flow chart diagram.