omega kickstart

I am a newbie to html, css, drupal etc. I am also just learning to use firebug.

I am sub-theming the commerce kickstart theme, which is already a sub-theme of omega kickstart.

I placed a logo file that is bigger than the logo that came with the template and it looks good, except it has added a lot of space between the branding zone and menu.

Can someone please give me a step by step to fix this problem?

Thank you so much!