Hello,
Welcome to JustAnswer.
There are various methods we can solve this issue.
One of the easiest way is modifying the functions.php file of your blog(if you have FTP access to your site which is most probable), details about how to fix this issue is given in this link: http://tinyurl.com/6hbmwx
Follow the steps in this manual to fix the issue and if you need any help at any step you can always ask.
Hope this helps.
Computer Software Specialist
Professional software developer and working as a system engineer in top multi national company.