When you are debugging a program, you will probably have the debugger stop or pause at certain points in your program (see Using breakpoints in the EGL debugger for more information on using breakpoints to make the debugger pause while debugging your program). Whenever a program is paused, you can view the current values of the variables in the program.
To change a value, right-click the value and choose the appropriate option from the popup menu. The wording of the option varies depending on the context.
For more information, see "Buttons in the Variables view" in this topic.