In Microsoft Word, setting the page number to a starting page of 10 can be done by following these steps, which I'll explain below.
Open the Word document and enter the Header Footer editing mode. First, open the Word document. In order to set the page number, you need to enter the edit mode of the header or footer. In Word, you can double-click an empty space at the top or bottom of the page, or select the Header or Footer option in the Insert menu to enter header or footer editing mode.
Locate and edit the page number settings. Once you're in header or footer editing mode, it's time to edit and set the page number. Normally, the page number is set under the Page Number function in the Insert menu. In Word, you can select Insert - Page Number, and then select a position such as Bottom, Top, or Edge to insert a page number.
Set the starting page number to 10. In the settings for inserting page numbers, there is usually an option such as "Format Page Number" or "Page Number Setting" through which you can set the starting page number. In the settings window that pops up, find the Start From or Start Page Number option and set it to 10. This allows you to specify that the page number starts at page 10.
Turn off Header Footer editing mode. When you're done setting up the page number, remember to exit header or footer editing mode by clicking on a different area of the page, or by double-clicking on the body area. Once you've finished setting up and turning off the header footer editing mode, you should be able to see page numbers starting on page 10 of your document.
In summary, with the above steps, you should be able to successfully set the start page of page numbers in your Microsoft Word document to page 10.