i would like to add tablet to get a wifi internet
Add wifi on my tablet
All iPads come with wifi. Not all iPads come with the
ability to connect to a cellular network. If this latter
connection is what you seek, you cannot add such
capability to your iPad after purchase.
What model iPad do you have?
https://appleinsider.com/articles/21/01/05/how-to-tell-what-ipad-model-you-have/amp/