Adding buttons to workbooks in Excel is a simple process that can be completed in a few steps.

1. Open the workbook in which you want to add a button.
2. Click on the "Insert" tab.
3. Click on the "Shapes" drop-down menu.
4. Select the shape you want to use for your button. For this example, we will use a rectangle.
5. Click and drag your mouse to draw the shape on the worksheet.
6. Right-click on the shape and select "Add Text."
7. Enter the text you want to display on the button. For this example, we will use "Click Me!"
8. With the button still selected, click on the "Format" tab.
9. In the "Shape Styles" section, click on the arrow next to "Shape Outline" and select "No Outline."
10. In the "Fill" section, click on the arrow next to "Fill" and select "Solid Fill."