Hello, Xeen, sorry to hear you're having trouble.
For an example on how it is supposed to work, please see the screenshot below where I've marked on the button order.
So for this particular 'move', you are supposed to hit the up arrow first, the down arrow second, then the up arrow again and finally the right arrow. The buttons are on screen, selected with the mouse - I remember someone was having trouble trying to use the keyboard.
Once a 'move' appears on screen you have 3 seconds to hit the first direction button and then a second each to hit the next three directions, so trying to press them to the rhythm of the music will help you there.
Does this make sense? Sorry if I've just confused you more ^_^;
Please let me know if this helps any and thanks for playing