Enable the Developer tab: File > Options > Customize Ribbon > check Developer > OK
Go to Developer > Insert
Under Form Controls, select Checkbox
Click on the worksheet where you want the checkbox
To edit the checkbox text, right-click the checkbox and select Edit Text
To move or resize the checkbox, right-click it and drag the border
To link the checkbox to a cell, right-click the checkbox > Format Control > Control tab > Cell link > select a cell > OK
Copy and paste the checkbox to add more checkboxes if needed