Step 1
Use the keypad given to enter calculations.

Step 2
Click on "=" to process the calculation.

Here is how you use the buttons

CLEAR    Removes all text in the texfield.
= Processes the calculation entered.
DEL Deletes the last element before the cursor.
Move the cursor left.
Move the cursor right.
Exponent.
$√{□}$ Square Root.

If you are not using the keypad. Here's how you use the features on the calculator.

KEY             FUNCTION
^ Exponent.
^2 Squared.
/ Fraction.
* Multiply.