Related Questions:
How can I adjust the answers given on a Intake Form in the Booking?
How do I adjust my answer in a Custom Field on a Booking?
How do I edit details within a Booking Custom Field?
How do I edit answers under Other Fields?
Answer:
You are able to adjust what is written in a Custom Field by clicking on the answer already there (It will be highlighted in yellow).
You can also edit it if it is blank, simply click where it says none (It will be highlighted in yellow). This will allow you to edit the field.