Hi slinky-welcome. I don't think you can with your iPad 1. You can use your phone as a hotspot to your iPad, but your first gen iPad won't be able to itself.
Welcome to the iPadForum! This Forum offers so much information related to the iPad (original-New), Acessories, Apps, Help, and Apple News.
The iPadForum also includes a Regional Ipad Group for international users across the world. This is a wonderful area to "find" members from your own country. Regional iPad Groups