Can't upload photos to a website ...all greyed out
I have MacBook Pro with Mavericks.
I am trying to upload a photo to a small local website for local traders (nothing big like Facebook or eBay). The photo in question is a .jpg and is located on my Desktop, having been taken by my iPhone and sent to the MacBook via streaming.
In order to upload I have to click a 'choose file' button on the website which opens a window in Finder. I click on Desktop and I can see my photo (and all other photos) greyed out.
I have put this thread in iPhoto thread although I am not using iPhoto in this case, although somehow I suspect that iPhoto maybe involved somewhere along the line, perhaps in the transfer process from my iPhone to the Mac.
Having searched this forum I can see that to access photos all I have to do is click File...Open...Media....Photos.....and there I have all my photos. However, this is not what I want to do. I want to upload to a specific site, and that site automatically takes me to Finder where my photos are greyed out.
How can I bypass this?
Many thanks
MacBook Pro, OS X Mavericks (10.9.1)