You can now select the Flashbots Protect RPC from the dropdown list whenever you want to switch. Note that if you switch away from the Flashbots Protect RPC while your transaction is pending it will send your transactions to the RPC endpoint you change to. In the case of the Ethereum mainnet this will emit your transactions to the public mempool.
Note: Your transaction will be sent privately to the miners, hence it will be publicly viewable on Etherscan only after its successful completion.
You can also watch our step-by-step video
Example on Uniswap:
How to cancel a transaction
To cancel a transaction you need to hit the “cancel” button next to a transaction. If you cannot get this to work on the Flashbots Protect RPC, try switching back to the default Ethereum mainnet RPC. This extra step will be removed in future.
Note: Cancellations are not free as they are transactions that are sent to the mempool.