by bob_r » Sun May 01, 2011 6:35 am
Go to Image Size and change your larger "Pixel Dimensions" number to 800 pixels or you may have an option under "File" to "Save for Web and Devices".
I have Photoshop CS5 rather than Elements, but believe one of these options should be available.
You could also open a free Flickr account and post a link from their site. If you decide to go this route and have trouble, let us know.