To **Log Out**

 - Click "Stack Exchange" on top. It comes a menu
 - On the top right there are `blog` `chat` and `Log Out` links

Maybe just you have created this account accidentally you can remove it.


**References** 

 1. http://meta.stackexchange.com/questions/5999/how-can-i-delete-my-account 
 2. [Deleting account](http://meta.stackexchange.com/help/deleting-account)