Hi Nancyinanderson and welcome to the HP Forum,
I understand that you are having a problem getting HPToolBoxFX to recognize your HP Color LaserJet CP1518ni Printer. I will try my best to help you with this problem. To better guide you could you please tell me what operating system you are running on your computer please?
Here is a document for Using HP ToolboxFX, not all operating systems are supported.
I hope this information helps, please let me know.
Thank you,