If you want more fine-tuned control you can switch to the HTML editing mode and add CSS (Cascading Style Sheets) code directly into tags using the style attribute.

New features in Freeway 5 include the ability to create Cascading Style Sheets (CSS)-based menus, personalized Blogger templates, Google Actions to help users add Google content to their sites ...

You can also add a background-position attribute to your CSS, with values such as center, left top and right bottom. Add this attribute to make your GIF appear at specific locations in the background.