You have to upload the images to the location of the website and have it linked based off of the site root.
The typical way to do this is to have a images folder in the site root directory (the root directory is where your home page is, which should be index.html or default.html. Then in your website code you have the img tag linked to the url where the image is located.
We asked for screenshots to see what the website looks like, and also to see your code. Cant really tell you want is wrong with it, if we cant see it.