Look all around your hosting company's site and in your site control panel. Hopefully you should find info on if they'll let you use them and if so, how they want you to set it up. If you can't find anything, call and ask them 🙂
Btw, just so you're kinda aware of the process, google for something like "setting up a cron job" and get familliar with the process in case you need to set one up manually. If you're lucky, your host will have an option to create them through your control panel.