Drag an asset onto a tier to rank it. You can also tap an asset to select it and then tap a tier. Items reorder inside a tier, and you can send them back to the asset area the same way.
The image panel loads your own images. Each one is cropped to a square from the center and becomes an asset. The tier panel renames tiers, changes their color, reorders them, and adds or removes them.
Double-click a panel title to switch how the panels are laid out. In the movable layout you drag panels wherever you like and keep several open at once; in the fixed layout a single panel sits in the top right.