If need to do things like work with macros or re-attach your file to its master template, you'll need to turn on the Developer tab. The video below shows how to do this:
You can also follow the written instructions below:
In Microsoft Word, go to the File menu, then click on Options.
On the left, click on "Customize Ribbon" (fourth from bottom on the left).
In the pane on the right, scroll down until you can see the word "Developer" (it'll probably be under "View").
Tick the box on the left of it, then press the OK button.