How to I use the other 3 editors in SmileBasic?
You're referring to the four program slots, right? What do you want to do with them exactly?
You can load programs with LOAD "PRG2:FILE",0 (for example) and run them with EXEC slotNumber (or USE slotNumber, to just define COMMON functions)
A better way is to do, for example, EXEC "PRG2:FILE" (or USE "PRG2:FILE" )