Here's how to do it:
- Right click on the tabs then click Customize Ribbon.
- Check the Developer checkbox in the right column and click OK.
- In the Developer tab, click Insert, and then choose the Checkbox option under Form Controls.
- Click on the cell where you want to insert the checkbox. You can resize or move the checkbox after it appears.
- Right-click the checkbox, select Edit Text, and modify or delete the label as needed.