To answer literally, see
http://word.mvps.org/FAQs/MacrosVBA/InsertingTextAtBookmark.htm for how to
put text _inside_ a bookmark, replacing whatever text (if any) is already in
it.
More fundamentally, you shouldn't be re-using the same document multiple
times. Make a template containing the text, the bookmarks, and the userform
and code. Use an AutoNew macro in the template to display the userform when
you click File > New and choose the template. The userform fills in the
bookmarks, and you then print, save, or discard the one-use document. The
next time you need to fill in the form, start over at File > New.

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Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org
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> Work on my first form is progressing nicely, and I am almost ready to
> start using it. One thing I have not been able to figure out is,
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