json rpc – Where can I find RPC_User and RPC_Password for my Python Script?

I’m still struggling with this to obtain “rpc_user” and “rpc_password” this is the Python Script

I did try others to fill in others network like Blockdaemon.com but it does not work, which is why I take off and leave it empty then I get the same error as per the snapshot below:

I have tried to find LocalHost to support this but it doesn’t work even though via CMD and Ubuntu.

Any recommendation? Sorry again to inform I’m no expert in this as I’m a nerd who is still figuring out the way to solve this. My GOAL is to able to Connect to any LocalHost for me to Post my Bitcoin Transaction.

Appreciate your guidance on this. Many thanks.