Go to the following file:
root/templates/protostar/css/template.css
Search for the logo and edit or add the following:
#logo {
position: relative;
left: 100px;
}
or on line 6936, you will find the .site-title { }
block, which you can replace with the following:
.site-title {
font-size: 40px;
font-weight: bold;
left: 100px;
line-height: 48px;
position: relative;
}
In future, start getting used to your browser console and start inspecting elements. If you're using Firefox, then I would recommend using Firebug.