Is there any piece of code that needs to go in the {}? thank you

No. That is what makes it a simple actor. You only use non-protected methods provided in the Actor class on instances of the class (getting and/or setting its image, location, rotation and world; and testing if at edge). It is useful for many object "types" without having to explicitly define them. I find it very useful for GUI type objects, which the timer display is; but, there are many other uses as well.

Hey okay so I was able to display the timer but its showing in milliseconds, even though I am using the timer code that I sent you earlier. Can you provide code to display the timer in seconds and also in minutes? thank you for your help.

Please refer to my Value Display Tutorial scenario.