The Flowers tab, is where you enter details of the flower orders you have for this funeral.
Each entry is to order a particular tribute from a florist, and details about this tribute, details on the left hand side are for this particular tribute.
Flower tributes are entered in the stock configuration page, along with its price, you can modify the price here, in case a different supplier has different pricing.
Also, on the right hand side, you can specify the overall arrangement notes, whom the flowers will end up getting donated to, and finally, who will collect them afterwards.
The list at the bottom is a summary of each individual flower tribute, which can be double clicked to bring up that tribute, and modified, if it has not been ordered yet.