Due to the fact i don't use Cron/Schedule Task at all i was completely lost when setting this up for Plesk 12+
Thought other users may benefit from this:
Navigate to:
Login to Plesk --> Tools & Settings --> Scheduled Tasks --> Click Plesk Administrator --> Click Add New Task
Description: Name for this task
Schedule Notification: Select your preference
Path to Execute: DRIVE:\Plesk\admin\bin\php.exe
Arguments: -q "DRIVE:\Plesk\VHOSTS\yourdomain.co.uk\httpdocs\components\com_easydiscuss\cron.php"
Replace Drive:\ with your drive i.e D:\ or C:\ & yourdomain.co.uk with your real domain name.
Task Priority: Normal
Minutes: 5
Hours: Every Hour
Day of the month: Every Day
Months: Every Month
Days of the Week: Every Day
Seems to be working fine now