Dear Lawrence,

Please keep push down the zone slot button, then you can easily insert the wire or loose the wire. If the metal part too short, you can peel off a little bit.
When you loose the zone slot button, the wire should be secure inside. Please let us know if it works. If not,  please send us email to support@netrohome.com with your Netro account registered email.

Thanks,

Netro Support