Kodak easy share 5300 all in one printer

Question

Printer won't let me print .

The window says that the printhead missing not installed correctly or has come loose.
It says that it has to be removed and reinstalled but I don't know how to remove it.
I have been using the printer every day and it has been fine but when i turned it on to day this is what it told me and it won't do any thing.
Can you help?
Al