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This topic is STEP 3: Edit the element's parameters in its dialogbox.
The image below is a dialogbox. It is the Dimension dialogbox.
It has one parameter (Dimension) and databox (currently set to 300).
In this image of the Dimension dialogbox, I have added a 'window' to highlight the parameter box. The three areas of the parameter box are:

There are three different procedures you can use to edit a parameter in a dialogbox.
Enter a value directly: 1.Use your keyboard to enter the datavalue 2.Press the Enter key on your keyboard to update to the new value You must press the Enter key. 

Enter a value as a symbolic equation: 1.Use your keyboard to enter an equation 2.Press the Enter on your keyboard to update to the new value You must press the Enter key 

Symbolic parameters for an Equation: •Simple Arithmetic: +, –, *, / •Indices: ^, Sqrt() •Trigonometric (Angles are Radians), Sin(), Cos(), Tan(), Sinh, Cosh, Tansh, ArcSin(), ArcCos(), ArcTan2( ; ) 
SpinBox arrowhead buttons (in the CYANBOX) Top : Left arrowhead to subtract (–) the parametervalue by the SpinIncrement Top : Right arrowhead to add (+) the parametervalue by the SpinIncrement Bottom : Left arrowhead to divide (÷) the SpinIncrement by 10 Bottom : Right arrowhead to multiply(×) the SpinIncrement by 10 

EXAMPLE: Edit the ParameterValue •Click the Top & Left arrowhead: Subtract the SpinIncrement(1) from the parametervalue •Click the Top & Right arrowhead two times: Add the SpinIncrement(1) to the parametervalue 2 x Edit the SpinIncrement •Click the Bottom & Left arrowhead: Divide the SpinIncrement by 10 •Click the Bottom & Right arrowhead two times: Multiply the SpinIncrement by 10 2 x WARNING: The model rebuilds each time you click the top arrowhead buttons in the SpinBox tool. If the model is complex, there is a long time to update the model. 
< > 'DoubleClick' 

Doubleclick inside the databox to hide the SpinBox. Doubleclick the databox again to show the SpinBox. 
To see the Zero / Round / Paste / Copy menu: 1.Rightclick inside the databox The Zero / Round / Copy / Paste contextualmenu shows. •Zero  the parametervalue becomes zero(0), or the smallest possible value for the parametervalue •Round  the parametervalue becomes the nearest value that is exactly divisible by the SpinIncrement. The SpinIncrement is below the databox  ten(10) in the image •Copy  to copy the parametervalue to your clipboard. •Paste  to paste the parametervalue from your clipboard. 