When you select the Furnish icon in the Insert ribbon, a Furnish panel opens up on the left. When you click on any of the drop-down menus therein, a list of options pertaining to that drop-down type opens up. These are called categories. To select a category, simply click on the option bearing that category name.

Once you select the category, a carousel with that category name as the header, opens up at the bottom. There will be an intermediate bar between the header and the row of thumbnail images, with one or more tabs. These tabs are sub-categories. To select a subcategory, simply click on the tab bearing that subcategory name.

The thumbnail images that are present beneath the subcategory bar, represent the Groups. When you click once on a particular thumbnail image, the default item, called SKU, under that group gets added to your cursor for you to place.

Sometimes, a group's thumbnail image may contain a drop-down menu of items within. These options are called SKUs. To select a SKU, click on the drop-down menu in the appropriate thumbnail, a select an option from there by clicking on it once. Then, click on its group thumbnail to add the SKU.