Is this for XP or VX? and do you want to return to the title screen or close the game completely?
I'll assume that this is XP, but if i'm wrong just tell me.
If you look at the Scene_Save script at line 33:
$scene = Scene_Menu.new(4)
That is the line that takes you back to the menu after you've saved the game. If you want to return to the title screen after you've saved the game, replace that line with this:
And if you wish to close the game completely replace the line with this: