My iPad Pro does not have a SIM card slot

How do I add this Verizon SIM card to my iPad pro

Is your iPad Pro a Wifi+Cellular model?

If so, it should have a sim card slot on one side.

Steps here:

Remove or switch the SIM card in your iPhone or iPad - Apple Support

You cannot add Sim cards to Wifi only models.

See the image at iPad Pro - Technical Specifications - Apple

How do I add this Verizon SIM card to my iPad pro

All iPad pro cellular+WiFi (not including the WiFi only models) models have a SIM card slot located on the lower right side of the device