If you need to write an acknowledgement for a document in Microsoft Word, you can do so by following a few simple steps. First, open the document in which you want to insert the acknowledgement. Next, click on the "Insert" tab and then click on the "Text Box" icon. A text box will appear in your document. Type the acknowledgement text into the text box and then format it as desired. Finally, click on the "Save" icon to save your changes.