Themes dosn't look fully

[mindbb]

Hello Support Team..

I have a problem with themes...
When i import or upload themes for my website those themes are not looking full..the banner of the theme is not be showed on my website...
Like this>>>http://forum.faint-freakers.com (my website,Banner and menu button doesn't show correctly)

What kind of problem is this????
if i didn't upload or install my theme to mybb so please give a clear concept of install a theme for my website..

Thanks....