Check out how you can get the in-game registration card required to play Mario Kart Tour here! Explains what Registration Card are how to create a Nintendo Account needed for one!
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What Is Registration Card?
Your Driver Licence To Play Mario Kart Tour

Registration Card is the required in-game registration needed to play Play Mario Kart Tour. You will need to link it with your Nintendo Account when you start the game.
Registration Is Done In-Game
Linking for the Registration Card is done in-game when you start the game app. No need to go to another site to do it, but you must have a Nintendo account first.
Nintendo Account Required
To link your Registration Card, you must first have a Nintendo Account. Dig out your old account, or make a new one.
How To Create Nintendo Account
1. Go To The Account Creation Page

Go to the Nintendo Account creation page by pressing the button listed below. You can also access it through Mario Kart Tour portal page.
Creat Nintendo Account here2. Proceed Based on Your Age

Account creation process will differ based on your age. For ages 13 or up, you can do so freely, but parental authorization may be required for those ages 12 or below.
3. Fill In Your Info

Pick a nickname, and then input your E-mail, password, birthday and location of residence, then agree to the user agreement to create a Nintendo account.
Can Also Use Google & Other Accounts

You can hasten your account creation by using your Google, twitter, & Facebook accounts.
4. Log Into Your Account
Log into your Nintendo Account at any Nintendo product page to confirm your account creation. Be sure to remember your password!