1. Double-click the hero icon in the bottom left corner of the screen.
2. Select the tab that looks like a book. This is the inventory.
3. Take the boots of levitation from the bottom of the screen and move them to the highlighted square on the hero's body. There are probably other boots in that square. If the boots of levitation are not at the bottom, try dragging the empty squares until you guess correctly.
Each artifact is worn on a specific part of the body. You cannot put boots on your head. Therefore, you can only wear one pair of boots on a hero. During transitions, you should wear boots that increase the hero's speed, and before a battle, you should change into combat boots.
The artifacts at the bottom of the screen do not work. You can give them to other heroes, and in version 3.0, you can also sell them. Each time after receiving a new artifact, you need to go to the inventory and see if you need to replace the existing artifact with the new one?
Example: you have a four-leaf clover, and you found a horseshoe. You need to move the horseshoe to the clover's place, because it is better. Otherwise, the horseshoe will be in the reserve, and the clover will be working.