Unless you provide a link to a page demonstrating the problem, no one will be able to offer much in the way of assistance. A screenshot is not of much use.
Thread Starter
mako2
(@mako2)
Re-upload a fresh, unpacked, copy of the theme’s folder to wp-content/themes using FTP or whatever file management application your host provides.
http://wordpress.org/themes/twentythirteen
Thread Starter
mako2
(@mako2)
I just uploaded a folder (not a ZIP) via FTP
I still dont see any place to add sidebars
[Moderator Note: No bumping, thank you.]