Where is my printer icon ??

As printer drivers are a preference setting not an application and can't be placed in the dock, it is located in:

Apple Menu > System Preferences > Printers

Double click the Printer in the left column to reveal the settings menu for items such as supply levels, cleaning print heads, test page, depending on what that driver has available.

Are you saying you cannot get the icon to appear when double-clicking on its icon in System Preferences, Printers and Scanners? Are you saying that when you print something no icon appears in the Dock? If so, disregard the following and consider the possibility of updating the print driver on your computer.

If you do see the printer while the job is printing, here is one (slightly clunky) way to get and keep the icon in the dock. Print something. While the print icon is in the dock click on the icon, which should open a window showing the details of the print job. This open window will keep the icon from disappearing at the end of the print job. Now, control-click the icon and select "Keep in Dock". That should do it - at least it worked for me.

Normally the printer icon only appears in the Dock while you are printing and then disappears when the print job has completed. You can put the printer icon on the Desktop however - it is useful when you have more than one printer since you can drag print jobs directly to the printer icon to direct the print job to it. Open System Preferences and select Printers & Scanners. Drag the printer icon to the Desktop.

The printer icon normally is in the topline of the active application, not the on the mac itself. If it is not in the topline of the open application, you should see it in the "File" item on the application menu in the bottom of the list.