[b]Not working? [url=http://mohsmath.wikispaces.com/file/view/iterations2.ggb/515902280/iterations2.ggb]Download the original file [/url][/b] Use the pointer to move the cursor, which is at (c, x). Once you click on it, use the arrow keys to make fine adjustments - up/down will change x and left-right will just change c. On the right, you'll see the orbit of x according to the graph of [math]f_c(x)[/math]. Use the Move tool or the zoom tools to change the size of the left window.