Command button is not working by using VBA

Hi,

However I designed my first form including a CommandButton which should paste a text into a TextBox (I programmed this function in the VBScript Editor). If I am working in the Developer Mode and click on "Run This Form", the function works properly.

However if I open the form and directly click on the CommandButton (without
entering the Developer Mode and clicking Run This Form") or if I send the
Form, it doesn`t work anymore.

This is the Code I use:

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How can I make the CommandButton work ALWAYS????