Greetings, I'm running shadowcoind and my wallet is encrypted.

The correct command for making a payment should be:

sendtoaddress - sending funds

from: https://umbra.academy/index.php?title=Introduction_to_Shadowcoind

But in return I get this error:

Error: Please enter the wallet passphrase with walletpassphrase first.

So I need to pass on my wallet passphrase in the command, but how?