There is a button for each symbol that can be added. These Include:
1> Slide Up
2> Slide Down
3> Hammer Up
4> Pull Off
Here's how it works:
First, select a note. Look in the lower text box to see your note appear. Next, choose what action you'd like taken, then push the appropriate button. Look again at the textbox, you should see the special character added.
Note: The Application requires that the next thing you do is add another note. It will present a popup window if you do not or if you try to add a note on a string other than the symbol. The only excpetions are for vibratos and bars.
After you choose the second note, your action is complete, and you can begin to add any other note you want.