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you call Excel functions with Application.WorksheetFunction.SomeFunctionName. However, Dec2Bin is special, as it is an Add-In function, and not a pure Excel function. Hence,Application.WorksheetFunction does not work here. Instead, you have to make the functions of the add-in available to your code. To do so, follow these steps
In Excel, menu Tools/Add-Ins, make sure that the add-in Analysis ToolPak - VBA is imported.
Then, set a reference to this add-in in your code: in the VBA editor, menu Tools/References, add a reference to atpvbaen.xls.
Be reminded that you need to have Professional/Ultimate versions of Office to be able to write macros.
You create a macro using Tools > Macro > Visual Basic Editor, write you VB function code which is pure VB syntax, then apply it to the cells you want, for example if I wanted to create a macro to add sales tax [which is too simple to be created as a macro but am doing it for the sake of it's readability], you can write:
Function SalesTax(Price As Variant) As Variant
SalesTax = Price + (Price *0.16)
End Function
Then you'd use it in cell C4 for example to calculate that tax of the price in B4 like this:
SalesTax(B4)
