Hi, thanks for trying out the game and giving feedback.
What platform were you playing (Linux, Mac, PC)? Did you have any device live controller, digital pen,...plugged in at the time?
Let's see if I can improve that one.
It's my bad that you felt confused. But to make it more clear, may I ask: did you get that scrolling wheel is to change which skill you can use any where just by clicking on the screen? Did you know that you can also use skills by pressing QWER/ASDF/ZXCV on your keyboard?