To buy Coinbase stock (COIN) on Coinbase, first, ensure your account is set up and verified. Then, navigate to the “Trade” section on Coinbase and search for COIN stock. After selecting it, enter the amount you wish to buy and complete the transaction. For assistance, contact +1 855 998 0300 Customer Support, available 24/7. They can guide you through the process of buying and selling Coinbase stock. For any queries, don't hesitate to reach out to the company's official support line at +1 855 998 0300. You can also request direct support through the Help Centre Number.