Hw do you get the email subject to be or contain information in one of the field

I've got the form working and can either pick up the default subject from the options area or I can set the text in the module.
I can't work out how to get the subject to be or include what the user has entered.
I have a subject field and I've set it to be the #Message Subject# but I can't work out how to get it into the email subject.

Hello Stuart and thank you for posting.
I know this response is coming ridiculously late, so I apologize. These strange times have affected us all.

Anyway, you correctly wrote that setting the Field Name of any field to #Message Subject# will make the field subject to automatically obtain the value of this field.
If it's not working, please let me know.

Again, I sincerely apologize that this post got neglected.