Adding nitro groups to a benzene ring

Just wondering how to draw a nitro group on a benzene ring? 

1. Put a benzene ring onto the canvas.

2. click on a bond tool, then click on an atom of the benzene

3. click on the "abbreviated group" button on the tools toolbar (left)

4.click on the list then choose NO2 (simple type no2 then Enter)--NO2 should appear on the mouse tooltip

5. click on the "CH3" group of the benzene (which substitutes it with NO2)