You have to tell the data source how often it should be updated and when. Why is your data source supposed to be updated, and what actually happens after it is? After a data source update, the campaigns you created with that particular source will automatically be updated as well, followed by a synchronization with your advertising systems.
You can find your settings in the data source menu, under the Update schedules tab.
You decided how often the source should be updated at the very beginning (you can change the settings at any time (1.) and switch to a different tariff). Now you have to set the update time (2.). We recommend you use the time when e-shop administrators finish adjusting the products and their prices.