Can't link my Paper Wallet to Blockchain
When you are in your Coinbase account use their "Send" feature to send coins to your paper wallet. It will then prompt you for a wallet address to send the coins to. Enter your paper wallet address there. Choose the amount to send, etc.

More here: https://support.coinbase.com/customer/en/portal/articles/971437-how-do-i-send-digital-currency-to-another-wallet-

If you are keeping the coins for yourself, there are better alternatives than paper wallet. If you are giving as a gift, just make sure recipient knows what to do or no do with the wallet.