Menus are a good way for the program to interact with your users, and a good way for them to navigate your program. A simple menu is done with one command, the "Menu(" Command. It is accessed by going to [PRGM] {C}. It works like this:
:Menu("Title","Option1",Label1,"Option2",Label2)
A sample menu would look like this:
:Menu("Main Menu","New Game",NG,"Load Game",LD,"Save Game",SV,"About",AB,"Quit",Q)
Now, obviously, you will need to make Labels NG,LD,SV,AB, and Q somewhere in your program for the Menu to go to. You can only have seven options in your menu. So, try adding a menu to the front of your guess program with a start and quit option. For this quit option, just use the "Stop" command under your label.