I lost my ipod. How can lock the ipod

Assuming you have an iCloud account and the iPod is an iPod touch that is signed into the iCloud account, go to www.icloud.com. Click on "Find my iPhone". Click on your iPod icon. The option to remote lock and others are there.

My Ipod is registered for this feature but it dosn't show up when I'm searching it. What it is broken or shut off?

Is it still visible?