Click an Add Atom button, then click and drag the atom to the black box. There, you will see the name of the atom. Click and move more atoms to make more molecules. THIS IS A WORK IN PROGRESS. DONE!
I added: Ozone, Formaldehyde, Methanol, Hydroxide, Propene, Propyne, Nitrogen, Ammonia, Nitrogen Dioxide, Nitrogen Monoxide, Nitrous Oxide, and more!