1. Click Management
  2. Click User Defined Fields
  3. Select the Category the existing UDF is saved under - (if you aren't sure which Category the field is in, you can use that Find field to search by the name of the UDF)
  4. Click on the Name of the existing User Defined Field
  5. Click to the Values step - (if it doesn't automatically direct you to this step)
  6. Type the new value that you would like to add into the blank field
  7. Click Add Value
  8. Click Save and Finish