On both the Sync screens (iPhone and Windows) there is an option to "Automatically Sync". Kindly check if it is enabled.
If they are enabled and the phone still doesn't sync, you can uninstall the Notezilla app on the phone completely.
Then install it again. When you launch it, it will request if you want to enable push notifications. You must enable it.
Push notifications are important to get notes updated automatically when you change notes on Windows desktop.
Then go to Sync option and sign into your account and download all your Notezilla sticky notes again.