Assuming that you are talking about removing the UV protective strip, use a seam ripper (you should be able to purchase one at any fabric shop). The UV strip is just acrilic canvas (Sunbrella like), and is just sewn onto your sail.
If you are talking about removing the sail from the forestay, the two posts are almost correct. First you must unroll the sail. It won't drop to the deck if it is furled.
Steve
Alchemist C-30T #4764
Alchemist C-320 #909
Alchemist C-380T #71