the graph is easy enough to locate.  you see a little arrow to the right of the adjustment wheel. click on it and a pop up menue will appear.  This menu is where you will find a number of options such as settings, reset and graph plus others.  Click on graph and one will appear.   there is a box in the upper right hand corner that allows you to change which adjustment like bend, twist, etc you want to use.  You can also click on the wheel of that adjustment to change what the graph to that adjustment.  To close the graph just click on the dot in the upper left hand corner.  It took me the longest time to see that symbol.

By the way, even though I do use a tablet, its not uncommon to use the mouse.  One of these days hopefully I will feel more comfortable with the tablet, as it works best in the graphic programs I use.