rosys.ui.keyboard_control() you enable steering the robot with the keyboard (see Getting Started for a full example).
Press the arrow keys to steer the robot while holding the SHIFT key down.
You can also modify the speed of the robot by pressing the a number key.
Use the optional parameter
default_speed to change the initial value.
When operating from a mobile phone, you can use
rosys.ui.joystick() to create a UI element with touch control.
You can drive the robot by dragging the mouse inside the top left square: