1. Visit Etherscan website
2. Click "Sign In" on the top-right corner
3. Login if you already have an account, or click "Sign Up" if you do not have an account
4. Once logged in, hover your mouse on your logged in username and click "API Keys"
6. Give a name to your API key (probably only you can see)
7. Copy and note down your API key for later
8. Get back to Remix IDE and click "Enable?"
9. Edit API key in Etherscan section and then click "Save"
10. Congratulations! you can now go back to 10-Minute Tutorial and complete contract verification