Do not be impatient. There are approximately 25 people who regularly answer questions here. We are volunteers and have other jobs. This is a user-to-user support forum and this was your first visit. As such, many users would not see your post until it was released by a moderator.

First, you need to understand that page numbers are fields. They can be inserted in any shape that can contain text.
Page Numbers in Word 2007-2016

Is the shape you are talking about the blue rectangle?
If so, the page number can be inserted the same way other text is inserted.
Alt+Shift+P inserts a page number.

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