Ted, this means you didn't copy the image URL. If you read the posts at the link that LWC3077 posted up it explains there are two options. If you are doing the one where you insert the image which is hosted on some other site, then you follow the instructions as above by Cyclegod.
But you have to make sure the image you want to display is shown in your browser at the site it's hosted, then select and copy the URL (the web address) from the address bar of your browser (ie where you type in web addresses).
Once it's copied, you can then place your cursor between the image tags, right click abd paste.
Easy peasy.