connection without password

Hi,
I try do a connection with Amazon server, but Amazazon use a Sftp protocol with a pubblic/private key.
So I use PuttyGen for create this two key, but I haven't a connection with our server.
which procedure to use to configure winscp using passwords to access another server?

Many Thank's

Anna

See https://winscp.net/eng/docs/guide_amazon_ec2