Hi Dorothea
You can log into your control panel, into your public_html folder and choose to upload the file - locate the file on your computer and upload.
It's important to remember that the link for the file needs to correspond with the file name itself .. so if the file is called apples and it is a .gif file then the link would be
www.yourdomain.com/apples.gif
You don't necessarily have to put this image on a blue voda page and publish, just so long as the image is in your directory - public_html is the directory for your main domain - if it is an addon domain then you would upload the image to the add on domain folder ..
Good Luck ..