If you want to add a button to a form, open the Control Toolbox toolbar (View
Toolbars > Control Toolbox) and choose the Button control, then draw it on
your document.
If you want to add code to the button, double click on the button and the
VBE will open.
The code is up to you. For instance to print documents doc1.doc and
doc2.doc the code would be:
Application.PrintOut FileName:="c:\temp\doc1.doc"
Application.PrintOut FileName:="c:\temp\doc2.doc"
Obviously you can get a lot fancier in terms of what to print where but that
should get you started...