1. Click the Developer tab on the ribbon bar
2. Click Insert in the controls section
3. Click the check-box icon from the list of options
To Add Developer Tab If Missing
1. Click File
2. Click Options
3. Click Customize Ribbon
4. Select Main Tabs from the Customize the Ribbon dropdown
5. Check the Developer check box

add checkboxes, list, combo boxes,radio button to excel

Insert -> Checkbox