Where does SIM card go on iPad 5?

Correct - at least insofar as a WiFi Only model iPad does not have any built-in Cellular capability or hardware.

Do you have a Cellular phone (an iPhone perhaps) that has a Cellular hotspot feature? If so - and your Cellular Airtime Contract allows tethering - you’ll be able to use a WiFi connection between your mobile phone and iPad.

How to set up a Personal Hotspot on your iPhone or iPad – Apple Support

A further alternative is to obtain a Cellular Router - commonly know as MyFi - and use this to create a Cellular hotspot to which your iPad can connect.

If yours is a cellular model, it'll be in the location specified in the Related Article above. If not, there isn't one.

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