A Step-by-Step-Guide on how to buy Kusama (KSM)
You receive the 10$ sign up bonus when you start a sell or buy of $100 USD or more within 180 days of signing up. It can also be 100 USD equivalent of your domestic currency and the amount can be a cumulative 100 USD, so it can happen over multiple purchases.
Also: you only get the bonus when you make an account with the Coinbase Promo Code Link from this site!
Step 1 – Create a Coinbase account and receive 10 $ Bonus in BTC
Use the following link for creating an account at Coinbase.
Use an email address, pick out a username, and pick a secure, strong password.
The infrastructure and webpage of Coinbase is secure and fast, so you're personal data is kept safe.