manual

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B. Press [ENTER] to get the result.
For example:
8+6-2+5-3-6+20=?
Take step A and then B.
4.2 Modify Operator
Steps:
A. Press the Right key to highlight.
B. Press the Up/ Down key to move the highlighted cursor to select the
numeral or operator to be modified.
C. Input a numeral or operator.
D. Press [ENTER].
For example: in the calculation of “8+6-2+5-3-6+20=?” modify “+5” as “-7”:
Follow step A and then B.
Input a numeral and an operator.