There is a Monklet in the CMS called "Section Monklet - Ministries Rotator." You can edit the title that displays above the rotator by going to Content > Sections > Home - Ministries Rotator in the CMS and you can edit the button link there as well.

To edit the Ministries in the rotator, you will use the Link List titled "Ministries - Section Rotator". Each link can have a title, image, and link. To edit this link list, go to Content > Link Lists in the CMS. 

Images should be 800px wide x 562px high.