Backup failed

Getting this error: The temporary processing directory (/var/www/vhosts/TeachingtoIntuition.com/httpdocs/wordpress/wp-content/plugins/wponlinebackup/tmp) where data is processed could not be created.
You may need to login via FTP and create the folder yourself and “CHMOD” it to “0770” or, as a last resort, “0777”.
Error: mkdir(): Permission denied

Have FTP access but don’t follow where to put the folder “0770” or what CHMOD refers to.

http://wordpress.org/extend/plugins/wponlinebackup/