Mail vs. Courier

I just completed my online application for the civil partnership visa however I made an error!  I wanted to submit the docs via a courier but in my state of nervousness I selected the mail option and even paid the extra $12 without thinking about it.  On the printed application it says "mail" for the submission method but can I still use the services of a courier or am I stuck sending it in myself?

Thanks!

You can still send it via courier. I did the same thing. selected the mail option but sent it via courier. It just means that you are out of 12 dollars. haha.

I did the same thing. The courier said not to sweat it.

I'm sweating so many other things, I don't mind leaving that one off.