I have an HP deskjet. I have an HP deskjet F300 All-in-one series, using it for a year, no

Question

I have an HP deskjet F300 All-in-one series, using it for a year, no problem. I am an elderly not very good operater though. I don't know what I might have accidentally changed. today I am trying to print out a note that I have just written in wordpad.When I press print in the file, a small window appears and in it is a side heading 'status'out of paper offline. I have the tray full of paper and I don't know what offline means.