Open it with text editor and just switch the two numbers next to home and back. Super easy fix

Label-1
but you've decided that you'd rather call it
Label-2
instead. You can't edit the name of a
label directly, but there's a simple workaround to accomplish your goal:Label-1
in the label list.Label-2
as your new label. (If you
already have some posts with this label, you can simply add that label, without
creating a new one.)