Asking about password but I have only key

Hi all, I'm very new in WinSCP don't beat me for stupid question, I was trying to google it.

I have blown my mind already, pls any help would be great for me, thanks in advance.

I use this code to upload test.txt into SFTP:/Outbound/Manual/. Pls see below:
But it's asking about password I don't have it at all.

BTW I'm not sure that this line I right? PutFile d:\TEST\test.txt /Outbound/Manual/

If you want to use a public key authentication, you need to specify your private key using -privatekey switch of the open command:
https://winscp.net/eng/docs/scriptcommand_open#privatekey

It's put, not PutFile.
See https://winscp.net/eng/docs/scriptcommand_put

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WinSCP GUI can generate full script template for you:
https://winscp.net/eng/docs/guide_automation#generating