First, we'll create the User Defined Field for Additional Guest Names
  1. Click Management
  2. Select User Defined Fields under Database Configuration
  3. Select the Category you want to save this new User Defined Field in
  4. Select New Defined Field
  5. Enter a name for the field, such as Additional Guest Names
  6. Select Text as your Data Type
  7. Click Next
  8. Select Journal Types: Transactions as your field application (do not check any other boxes)
  9. Click Next
  10. Do not mark any of these boxes
  11. Click Next
  12. Select Text Box as your Display Type
  13. Click Save and Finish

Then, we'll add the newly created User Defined Field to the DIY Form
  1. Click Management
  2. Click DIY Forms
  3. Click Edit to the right of the DIY form you would like to edit
  4. Click the plus icon in the upper right corner of the Section where you would like to add your User Defined Field
  5. Click Add Fields
  6. From the drop down menu, select the category where you stored the User Defined Field
  7. Select your User Defined Field
  8. Click Update
  9. Click Go Live to publish these changes