Data is stored in entities called Tables. You should provide a table name for the data imported into Zoho Reports.
You can also change the First Row Contains Column Names setting if needed. If the data imported contains any time/date values, Zoho Reports will automatically identify the format. You can also set your own date format.
While importing the CSV file, you also have customizing options like modifying the delimiter separating your columns, skipping the top n rows, specifying the comment character etc.