[Ron Wood]

Where are you trying to upload from? If it is from your computer you have to first select "Choose File" and when the window pops up you have to navigate to the image file location on your computer and click on the image file which will then show up next to the "Choose File" icon. After you have done the "Choose File" operation for each image you want to upload then click on the "Upload" icon. The list of images will show up in the "Attach Files/Manage Attachments" window. Then click on "Submit Reply".

If you are uploading images from some other location than your computer then you have to navigate to that site location and image when you do "Choose File". But it is really best to upload the images from your computer.