To move around using your mouse and keyboard, use the W-A-S-D keys to walk around and use the mouse to look around you and interact with any user interface elements.
W key: forward
A key: to the left
S key: backwards
D key: to the right
Left mouse button : Click and release while targetting a UI element (e.g button on the tablet) to select it.
Right mouse button : Hold the button down and rotate your mouse to look around.