1. Set up the attribute in Config and mark the Allow Only 1 per Record box in addition to the Active box.
  2. In Online Express click on the edit link for the form you want to add gift attributes to.
  3. Select the Extras tab.
  4. Toward the bottom you will see a section labeled "Select which gift attributes are available".
  5. Click Add attribute.
  6. Select the desired Attribute from the drop down menu that pops up.
  7. Type in the desired Display name.
  8. If you want to require the attribute then mark the Require box.
  9. Save and Close the form.