It seems that you are on a mobile device. You need a keyboard to control the cube.
The key i opens/closes this menu.
The Arrow keys rotate the cube.
The keys +, - zoom the cube in/out.
The keys t, T rotate the top layer.
The keys d, D rotate the down layer.
The keys l, L rotate the left layer.
The keys r, R rotate the right layer.
The keys f, F rotate the front layer.
The keys b, B rotate the back layer.
The keys e, E rotate the equator layer.
The keys m, M rotate the middle layer.
The keys s, S rotate the standing layer.
When you enter many rotations in a row,
they
are put on a queue.
The key u undoes the last layer rotation.
The key U resets the whole cube.
The key x stops the rotation queue.
The key X scrambles the cube.
The key c toggles transparent mode.