I forgot to include this in the last message. If you want turn of the previous led the code would look something like this.
Pressed = "HIGH" //Associating the value HIGH (5V) with the word Pressed (this can be any word you choose)
If(Button1 = "Pressed") Then //If statement
LED1 = "HIGH" //Turns on LED1/ supplies 5v
(else) // null else, does nothing. Some languages require different things with it
If(Button2 = "Pressed") Then
LED1 = "LOW"
LED2 = "HIGH"
If(Button3 = "Pressed")Then
LED2 = "LOW" //Turning LED2 off (0v)
LED3 = "HIGH" //supplying LED3 with 5v
EndIf //each if statement must have an "endif" depending on the language
Ps, there is probably a simpler way to program it. If your more problems that you need help with you can always go to these two websites http://electronics.stackexchange.com/
(for electronicsc) or http://programmers.stackexchange.com/