Ohbot as a puppet
How about getting Ohbot to react to a sensor? The Mouse X sensor block (on the sensor menu) gives the position of the mouse in the x axis as a number between 0 and 10. The Mouse Y block does the same for the Y axis.
Download the program
To download the program right mouse click on the link and select either 'Save Link As' or 'Save Target As' from the menu. Find a location to save the program to on your computer. Open up Ohbot software and use Open to locate the file that you have downloaded.