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GUI example
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Start Blender, in the VIEW_3D window, click the `add` button, select `Batoms` -> `Molecule`. The default CH\ :sub:`4`\  molecule will be created. 

.. image:: /images/getting_started_gui_1.png
   :width: 20cm

On the left bottom corner of VIEW_3D window, click the `Add molecule` menu (if the menu disappear, press `F9` to show it). Change the `label` and `formula` to "H2O". Then a H\ :sub:`2`\ O molecule will be created.

.. image:: /images/getting_started_gui_2.png
   :width: 20cm



On the right side of VIEW_3D window, click the `Attach Render` sidebar. Change the `Viewport` to: (1, 0, 0). Click the `Attach Render` again. Then press `F12` to render the image.

.. image:: /images/getting_started_gui_3.png
   :width: 20cm


Click the `image` button to save the image.

.. image:: /images/getting_started_gui_4.png
   :width: 10cm