Check the setting match those shown and click on 'OK'.
Move the cursor down and snap to the 'End' point at P2 to define the rotation. The staircase is complete.
To add the direction arrow select the Leader Arrow button. Click on the 'Mid' point at P3 then hold down the key and move the cursor down and click at approximately the position of P4.
Now select the Text button .
In the Text dialog box enter 'UP' as the text string, then click 'OK'. Now click the text into place just below the end of the arrow.