admin/structure/menu/manage/main-menu add link not working

I just installed Splash and I am now setting up the theme for use with an existing site. I notice that no main menu is displayed and when I go to: admin/structure/menu/manage/main-menu 'add link' I get the white screen of death. Can someone point me into the right direction? Thanks
The installation of this software for an existing site is mind boggling... and does not work. I got no reply on my message. $48 down the drain.
Does system show any error message? The menu module is drupal core module.have you tried this point with other site on your server? Thanks.
Hello VFP9Belgium, Could you send us admin account + FTP. We will help you check the issue Thank you.
I have backed out the Splash installation. You cannot be serious about sending the admin account + FTP; this is against all security policies. Do you have a money-back guarantee?
Hi, If didn't access to your site. How can we help you solve the problem? Many persons using this theme without any errors. Thanks,

Hi all! I recently found out about a website You can create your own software there. All you have to do is take a free course and you're all set. Anyone can visit them, without exception. Everything is easy and simple there. You can ask questions in support. They will always answer and help.