How are you connecting to PC? With my browsers (different versions of Firefox) I see...

Upload Pictures

Pictures to Upload

...then several boxes for the locations of the pictures, each with a "Browse..." button to the right. When I click on the Browse button it usually takes me to some irrelevant place on my hard drive -- from which, however, I can step over to where I keep my pictures and select a picture.

It's possible that your browser isn't displaying the Browse button due to some malfunction. If you're using some more minimal kind of interface, it might expect you to insert the URL in the box yourself. I guess I could do that if I absolutely had to; it's not much fun, though, and I'd go a bit out of my way to avoid it. URLs for files on your computer start with file:/// instead of http:// and use forward slashes / instead of backslashes \ -- otherwise they work the same as filenames. Oh, and if there are spaces or other special characters in a file or folder name, you might need to replace them with their ASCII numbers. Please, let's not get into that till we're sure we have to.