If you would like to position an image somewhere specific on your site / page here’s how:
Extensions, Module Manager > New > Custom HTML
Upload the image or paste the URL link to the image, give the module a name. Don’t forget to assign the module to the relevant pages under the Menu Assignment option.
Finally, under Module Parameters assign a Menu Class Suffix so that you can position this image in your css stylesheet.
using absolute or other attributes you can place this image anywhere on the page.