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The main list eventually presents you with all your registered attributes. You can edit or delete each using the buttons on the right of the table, or display their values by clicking on the "+" icon, which opens a sub-table.
You can also set the attributes presentation order on the front-office either by clicking on the arrow icons, or by drag'n'dropping each row when the mouse cursor indicates you canhovers the "Position" column.
One your attributes are in place and their values are set, you can create product variations (or "combinations") in each product's "Combinations" tab, from the "Product" page under the "Catalog" menu.
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