To start syncing, you need to create a sync account. To create an account, right-click on Notezilla icon and choose 'Sync'--> Create a new account. Key-in the necessary details and create an account. After creating an account you would need to activate the account using the order number sent to you on purchase. Once the account is activated, all your sticky notes will sync between all the connected devices and PCs.
To Buy/Renew your subscription click here: http://www.conceptworld.com/Notezilla/BuyNow
Once you purchase from above link, your subscription dates will automatically get updated.