Solution:

1) If the Database window is not active, activate the Database window.
2) Click the 'Forms' tab in the Database window.
Forms tab
3) Select the desired form from the form list. (The selected form appears highlighted).
4) Click 'Design'. (The selected form appears in the Design view and the floating Toolbox appears.)
5) Click 'Option Button' from the Toolbox. (The Option Button appears depressed.)
Click 'Option'
6) Select a location for the option button on the form area. (The cursor takes the shape of the option button.)
7) Click to select the location for the option button. (Both the option button and the attached label box appear.)
The option button and the attached label box.
8) (Optional) To set the properties of the option button or label box, do the following:

a) Click to select the desired box. (Handles appear around the box.)
Handles appear around the selected control.
b) Select the 'View' menu and select 'Properties'. (The property sheet appears.)
Property sheet for the selected control.
c) Select and type the desired properties in the properties boxes.
d) To close the property sheet, click the 'X' in the upper-right hand corner of the property sheet.
Click X button to close property sheet
NOTE: The properties will be saved only when the design view is saved.

9) Select the 'File' menu and select 'Save' to save changes.