How are you trying to connect to the printer by network or USB?
I understand, but are you trying to print to a network printer or a printer which is connected to by USB?
Ok, do you have a windows device (in addition to the chromebook)?
So you just have a chrome book not other windows PC's you can connect the printer to, as alot of the time you can use the windows PC to discover the printer and register it on google print, then when you go on your chromebook it google print has the printer listed.
When you go into google print on the windows machine does it show up?
Suggest we do a remote session, so I can have a look, rather than playing 20 questions.
Please click here and follow on screen instructions on the chrome book.
As per our conversation please try and add the printer on to Google Print via your Windows machine, and let me know how you get on. Once added via the microsoft machine the printer should appear on your Chrome book.