Using PowerPivot for SharePoint 2013 - Business Intelligence in Microsoft SharePoint 2013 - page 196

FIGURE 7-6 Accessing PowerPivot Data Refresh from a PowerPivot Gallery by using the Calendar icon.
Regardless of how you get to the Manage Data Refresh page, the details on it are the same.
Figure 7-7 shows the initial view of the page.
FIGURE 7-7 Enabling Data Refresh in the Manage Data Refresh page.