1. Upload file.
scp source.txt robert@9.186.23.31:/opt/temp/dest.txt
2. Download file.
scp robert@9.186.23.31:/opt/temp/dest.txt source.txt
After is is run, you will be prompted to input the password for user robert.
Reference
http://www.linuxdiyf.com/viewarticle.php?id=15013