Select a champion from the dropdown or search for a champion automatically.
Adjust champion levels to whatever you want.
Select your runes/masteries (NOT IMPLEMENTED YET).
Select any items that you want to add. To remove an item, click on an added item.
To process a basic attack, click on the "Basic Attack" button.
To use a champion ability, click on the champion ability icon (MOST ABILITIES ARE NOT IMPLEMENTED).
To remove an action (Basic Attack or ability usage), click on the desired action in the action queue to get
rid of it. Alternatively, you can use the "Reset Action Queue" button to provide a clean slate.