To adjust the placement of your logo, we'll need to adjust the "style.css" within the template folder which is being used on your site. (SGS > templates > "current template" > style.css)
Once you're able to locate the style.css file, right click it and choose View/Edit. Once in the style.css file, locate the following code:
font: bold 2.5em Century Gothic, Arial, Helvetica, Verdana, Tahoma, Arial, Helvetica, sans-serif;
The "30px" for top and "35px" for left show the distance from the top left corner of the SGS banner. By default, the logo will be placed 30 pixels below the top and 35 pixels from the left side of your banner. You can adjust this as you'd like and a 0px value for top and left will start your logo at the top left corner of the banner.