To add a new option you will have to go in your Back office. Select "Products" tab and then "Options".
Before adding a new option we will have to create an Option Category tapping on "New Category".
Once the category is created, you must add an option tapping on "New Option".
You will have to put at least the option name, you can add a price if the option is paying, his VAT etc.
If you need to edit the option, you just have to click on it and the option sheet will appear.
It's also possible to associate an option to a SKU. This functionality is however exclusively available from bulk update with a CSV import. For more info about the SKU, consult the following article.
How to create a new product? How to edit, delete and deactivate it?
To assign this option to a product, you must go to your Products tab, select the product and then in its product file add the option category that you have just created. And click on "Edit".
To delete an option you click on the red cross
To delete an option category you click on the "modify" icon and then on "delete category".