Will you please provide your site link? I don't get what you need to resize the logo image or the logo section.
In case you need to resize the logo image resize you need to resize it from photoshop or any other tools if you need to resize the logo placement section width or height I need to check your site. we already allocate the maximum size for the logo section. if you need even bigger I need to see your site.
Please do take some time to read through some of these links: