Brother 580C - Manual (Page 67)

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The BACKSPACE key allows you to remove unwanted characters from your
message. It differs from the
3 key, which simply moves the cursor without
changing the message. The BACKSPACE key, however, removes the character
preceding the cursor.
TO DELETE A CHARACTER:
(1) Using the cursor movement keys, position the cursor immediately to the
right of the character you want to delete.
(2) Press the BACKSPACE key.