View molecules - select a molecule from the selection in the right part of the screen. A drawing of the molecule will appear (if it can be drawn by ChemDoodle) and a read-only text area will be filled with the appropriate .mol/.sdf file.
Insert molecules - enter the name of the molecule and the contents of the molecular file to be stored. The file doesn't need to be in .mol or .sdf format, but its picture will not be drawn if it isn't. The list of molecules currently in the database is shown in the right part of the screen.
Edit molecules - select the molecule you wish to edit/delete from the selection in the right part of the screen. If you wish to edit the molecule's file, make the desired changes in the editable text area and press 'Edit molecule'. If you wish to delete a molecule, simply select the molecule and press 'Delete molecule'.