To send Bitcoin on Coinbase, follow these steps:

1. Log in to your Coinbase account on the app or website.
2. From the homepage or dashboard, go to the "Send/Transfer" section and select "Send Crypto."
3. Choose Bitcoin (BTC) as the cryptocurrency to send.
4. Enter the recipient’s Bitcoin wallet address carefully. You can paste a copied address or type it, but make sure it is correct.
5. Select the Bitcoin network for the transfer. Confirm the network matches the recipient’s address network.
6. Enter the amount of Bitcoin to send.
7. Review the transaction details, including any network fees.
8. Confirm and authorize the transfer, completing any two-factor authentication required.
9. Wait for the transaction to process, which may take around 30 minutes or more depending on network congestion.

It is important to double-check the recipient address and network to avoid irreversible loss of funds since crypto transfers cannot be undone if sent incorrectly.