I had same problem, and it was resolved recently.
You will solve it quick, you just need to do couple simple things.
1. Ask your host server for correct command line to run cron job on the server.
2. Open your host server panel and create cron job.
Now more details:
command line for cron job exist of couple parts: left part where you write path for some libraries (this is what you should ask your host server guys) and right part where you write path to your cron file.
Right part is easy, it looks like http://youdomainname.com/cron.php
if your store in a root of your domain. If it is in a folder magento it will look like http://youdomainname.com/magento/cron.php
Left part can look something like /usr/bin/mlget -q -O /dev/null
so you need to ask host server guys about that.
So probably whole command line will look like /usr/bin/mlget -q -O /dev/null http://youdomainname.com/cron.php
After you will know your correct command line to cron file open your panel on your host server and find somewhere Cronjobs
There you need to create cronjob where you will have options to select how often you want run a cron job.
Also you will need to enter there your command line.
Save it and life would be much easier.