Short answers, pulled from the story.
Napoleon signed his abdication at the Palace of Fontainebleau on the 11th of April 1814. The formal treaty was negotiated over several days following this initial rejection and signed by plenipotentiaries in Paris on the same date.
The island of Elba became a separate principality ruled by Napoleon under the terms of the agreement. Foreign powers guaranteed recognition of Elba's sovereignty and flag while allowing France to handle external relations with Barbary powers.
Plenipotentiaries Caulaincourt Duke of Vicenza Marshal MacDonald Duke of Tarentum and Marshal Ney Duke of Elchingen signed the document. Prince Metternich represented Austria Count Nesselrode spoke for Russia and Baron Hardenberg acted as the voice of Prussia.
Great Britain refused to sign because Castlereagh explained that signing would recognize Napoleon's legitimacy as emperor of the French. The British position held that the French nation existed in a state of rebellion and viewed Napoleon as a usurper rather than a rightful ruler.
Empress Josephine received reduced annual income totaling 1,000,000 francs after the treaty was concluded. She retained full property rights over her existing estates real and personal while Napoleon surrendered all estates he possessed within France to the French crown.