Ensure you are in a Word document, not a zipped file. You can't edit zipped files.

Click on the area or item you want to edit, like in a header, and make the changes you want

Paste your logo in the header area, and it will appear on every page

Search and replace by clicking "ctrl" and "f," and Word will serve up a dialogue box. You can also automatically replace anything you find by inserting "replace with" into the "ctrl" and "r"
a.) enter "Company Name" and replace it with your company's name
b.) enter "insert" and browse to all instances where a specific individual or policy must be inserted