How to use the scp command: SCP Syntax examles
How to connect using WinScp: WinSCP steps
How to change file permissions using chmod: chmod examples
It should be noted that none of these are Splunk-specific issues. You'll have an easier time separating your issue into Splunk and non-Splunk issues and using the appropriate resources for each. For things like scp or chmod you can always type
man scp to get the man page and see how the syntax works.