on (press)
{
if (myInput == "insertcheathere")
{
_root.hp = _root.hp + 100;
}
else
{
_root.gotoAndStop("");
} // end else if
}

Put this code onto a button, any button. Name the input text box "myInput", or change the name of it and edit the code above to match its name. You choose what happens by editing the code. If you do not have the variable of "hp" in the game, then it will do nothing, because that cheat code above says that the variable "hp" will increase by 100 when "insertcheathere" is typed into the input text named "myInput". So either edit the variable to match the one(s) in your game, or use this code in place of _root.hp = _root.hp + 100; to make a different frame come up once the player inserts the correct cheat code:

on (release) {
_root.gotoAndPlay("insert frame name");
}

--
SPAM is an acronym that stands for Stupid Pathetic Annoying Messages. ಠ_ಠ