Hoover Steamvac Upholstery Cleaner will not spray water.

\015 My Hoover Steamvac Supreme Model F5817 will not spray water. Do you know how I take the sprayer head off the hose so I can clean it incase there is something underneath the trigger?…or do you have any other suggestions what could be wrong..Also do you know where I could go to print out a manual..Thanks in advance for any help you can offer.!.Jane\015 – Hoover F5832-910 SteamVac Supreme Vacuum