There are a few universal actions that apply to the whole of VSM IV.
To turn a knob or move a slider, click and drag your cursor up or down for knobs and vertical sliders, and left and right on horizontal sliders. You can also use a scroll wheel or gesture whilst hovering over the knob you wish to change.
Hold down the shift key whilst moving a knob or slider to access finer resolution control.
On Window based parameters with up and down arrows, click the lower half of the window to move down through options. Click the upper half of the window to move back up.
For LFO Destination and Reverb preset you can also right-click to see a menu.
The bend range window does not have the arrows, here you click and drag up and down to the value you wish.