Select Connect to Server from the Go pulldown on the main Finder menu bar, and enter "smb://lolo.washington.edu" in the Server Address field.
Once you have mounted lolo.washington.edu, you can copy and paste files to the folder collaboration/xyz/abc where xyz is your hyak group name and abc is your hyak userid.
You can then ssh to hyak and cd /lolo/collaboration/hyak/xyz/abc to access your files.
Use the Mac's sftp command at a command line (here abc is your Hyak userid):
At the sftp command you can use 'cd' to go to the appropriate directory and 'put' to transfer files to hyak and 'get' to get files from Hyak.
Use bbcp. This is the recommended method for large amount of data. See below link: