Sorry I think there has been some confusion once you have created your custom field you will need to use its ID as seen to the right of the custom field list (see screenshot). Once you have the ID for example 4 you can use it with the following two options:
In the resulting email this will display the name you gave your custom field.
In the resulting email this will display the value entered into the field by the user.
For any other custom fields just use the same options above making sure to change the ID at the end.
Let me know if you have any follow up questions.
PS. I will also make this option clearing in the guides
Hi! I'm Steve the founder and head developer of CoalaWeb design studios. I'm an avid supporter of open source projects and the GPL license.