How do I go about changing where my page is that I'm uploading while publishing?

I have just put my website onto an external storage device so I can work on my site with any computer, but when I go to publish the page, it uploads from my c drive on my main computer. How can I change that to my J drive where my BVfiles are?

Sure appreciate any and all help!!

dlholl

http://www.sustainablelife.info