Before you can add checkboxes to an Excel worksheet, you will need to expose the Developer tab (if it is not already visible). To do so, click on the File menu and then select Options, followed by ...

When you switch to the Developer tab in the Microsoft Excel Ribbon and locate the Controls group, you can click on the "Insert" item to open its drop-down menu. You'll find the check box icon in ...

Select the cell to which you want to add the check box and click "Insert" from the Developer tab. You'll see check box icons under both Form Controls and ActiveX Controls.

Now we are going to insert the check boxes. Select a cell. On the Developer tab, click the Insert button in the Controls group, then click the Check Box from the Form Controls group in the menu.