Add the hydrogens

Now many hydrogen atoms need to be added. You can do this using the H-tool, but a much easier method is to use the Edit → Add Hydrogen menu command:

The 'Add Hydrogen' menu command works on the selection only, when present. Thus, only one hydrogen atom would be added to the oxygen atom. This is not what you want. So first we make sure that nothing is selected by clicking in empty space.

Click in empty (drawing) space

Now no atoms are selected any more.

Select the Edit → Add Hydrogen command

Many menu commands have shortcuts. In this case you can also use the shortcut (Control-H or Command-H, dependig on your platform) as an alternative. The shortcuts are indicated in the menu commands.

All atoms will be saturated with hydrogen atoms. And you have created an ethanol molecule, though the geometry is still far from perfect.