Cronjob using Z-cron

hi, i have a small problem (maybee a lot uf users) to make a cronjob, i have an hosting where i dont have cronjobs and therefore i have downloaded Z-cron ( i make with this a cronjob for openads(later openx)

how can i config this software to make the cronjob for PIWIK, maybee with a batchfile what i can use with z-cron but my knowledge is verry low. when somebody can help me with the code a lot of people can use the same system if they want

help appriciated