There's no such thing as "/cd .snapshots" On old servers, it'd just be /.snapshots if you're in FTP, or /home/USER/.snapshots if you're using SFTP. The "cd" part of it is a change directory command.
On new servers, there is no more .snapshots in home directories. Maybe the wiki entry that Atropos7 linked to is the new setup for all users. I'm on the old system with .snapshots, and the options that wiki article show up for me. Dunno about people on the new systems.