Cannot Access Console

Using the FTP client of your choice, go to wp-content\plugins\, and delete (or move) the wordpress-related-posts directory.

By the way: what version of WordPress are you using? And is this a local install or a live site?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)