phpMyAdmin is for administrating MySQL, nothing to do with setting up cron or other server tasks.
According to Django Europes FAQs:
Can I use cron jobs? Are there any limits?
Yes, you can use cron jobs. Simply type "crontab -e" in the shell to edit the crontab. There are no limits on cron jobs.
Therefore, I assume, they must have given you shell access as well. If not you'll have to speak to their help desk.