IPhone : how to delete a cell from a UITableView with multi section in swift

i'm trying to delete a cell from UITableView in swift, i follow this tutorial: http://www.ioscreator.com/tutorials/delete-rows-table-view-ios8-swift the problem is my UITableView has many section, so i can't delete the cell the way like the tutorial. any one know how to delete cell form table with multiple section? thanks.