We have our form almost ready and now we just need to enter a field that the person can fill. This can be done under the Developer tab. By default this tab is hidden and you might have to enable it in Word options. When you have enabled the Developer tab then go to Controls section and click Text. Now you have a field and we can protect the rest of the document from changes. In the Developer tab go to the Protect section and click on Restrict Editing.  Put the checks in and under the second option choose Filling forms from the drop down menu and press „Yes, Start Enforcing Protection”. Enter a password to protect it and starting from there someone using the document can only fill in the forms.