how do i find my printers IP address

The easiest way if the printer does not have LCD display is to print the test page. The IP is displayed in almost all network printers I know of. If it has an LCD display is go to the network menu.

All of Bob's comments apply but if you have never used bonjour.. on any airprinter.. it should be responding to bonjour and in safari there is a simple bonjour favourite.

You will need to turn it on in preferences. I can then find my printer via the bonjour bookmark.

Unfortunately, there almost zero information to go on here. We don't know......and you haven't told us....

What make and model printer you might have

What make and model router you might have

Whether you are using a Mac or PC to administer the printer

Whether the printer connects to your network using a wired or wireless connection

Whether the printer is operating correctly, and you just want to know what IP address has been assigned to the device

Whether the printer is not operating correctly, so it's not getting a valid IP address