Think of it like this: "Indo-European" is a language family that includes English, Spanish, Russian, and Hindi. You can't say "hello" in "Indo-European" because it encompasses many distinct languages.
To say "hello" in a Uralic language, you need to specify which language you're interested in.
Here are some examples:
* Finnish: "Hei"
* Hungarian: "Szia"
* Estonian: "Tere"
* Udmurt: "Шунды" (pronounced "Shundy")
* Khanty: "Ниво" (pronounced "Niwo")
There are many other Uralic languages, each with their own unique greetings. Let me know if you have a specific language in mind, and I can tell you how to say "hello" in that language.