Solution:

1) If the Database window is not activated, activate the Database window.
2) Click the 'Forms' tab in the Database window.
Forms tab
3) Select the desired form from the list box. (The selected form is highlighted.)
4) Click 'Design'. (The selected form appears in Form design.)
5) Open the property sheet of the 'Text Box' to change:

a) Click text box. (Handles appear around the text box.)
b) Select the 'View' menu and select 'Properties'. (The Text Box property box appears.)

6) Select 'Transparent' in the 'Back Style' property box:

a) Click on the 'Back Style' property box. (A down arrow appears to the right of the 'Back Style' property box.)
b) Click on the down arrow. (A drop-down list box appears.)
c) Select 'Transparent' from the drop-down list box.
Back Style property box

7) 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