Choose one of the inequality type graphs
by pressing F3 Type.
Press F6 for the arrow on the right, you will get the other types
For example press F1 to select the Y greater than type graph.
Notice that on the top line Graph Func: Y>. From now on all the graphs you will draw will be Y> some function in X.
Start entering the function. As you start the screen will show Y1>
Enter the function for example sin(X^2). Use the X, theta, T to input the X variable.
Press the EXE key to complete the function line. The screen will look like on the following screen grab
Press the F6 key Draw to get your graph and the shaded region, as on the following picture: