How to change default upload location?

The suggestion at the end of this Membership thread is to change the default upload folder location in order further protect content.

However, I don’t see Settings -> Miscellaneous in my admin nor do I see an option to change the path under the Media tab.

If I’m missing those two things, should I be concerned?

If not, what’s an alternative method?

I’m using WP 3.4.1 in a single install of WordPress on a subdomain.

Thanks in advance,

Mark