The Sony Entertainment Network accont on Xperia Z3 (SNE), lets you locate your lost device, get the most of Lifelog app, and opens up many more features to you. To create / add a SNE account on Xperia Z3, do as follows:
1. Open Settings and under Accounts settings, tap the +Add Account option
2. On the available types of accounts to add, select the Sony Entertainment Network option
3. If you've already registered for a SNE account, simply enter your ID and Password to add your account to your Xperia Z3 (make sure the Save Password option is marked)
4. If you are new to SNE and want to create an account, tap the Create Account button and fill out the form.
** Note that, in order to activate your SNE account, you must wait for the verification email which will be sent immediately to your provided email address, and verify your account using the received email