Kingdom Template and adding a Logo

I have a problem adding a logo to my Kingdom theme. I go to the Kingdom customization page and there i can choose to upload a Plugin, but when i try to upload the plugin the media box only hanging and it will not upload. I have search for it on the webb but don’t find a solution for My theme. Is it a them problem or what can I do to fix this. I have tried to change the theme and change it back to Kingdom theme but that does not help.
Hope someone can help me with this.