To check a box in Word, you can follow these steps:

1. Open your Word document.
2. Go to the "Developer" tab on the ribbon.
3. Click on the "Check Box Content Control" button.
4. Place your cursor where you want the checkbox to appear.
5. Click on the checkbox that appears.

If you want to add multiple checkboxes, you can copy and paste the checkbox control at the beginning of each line.