How to add new user accounts for Spark?

Hi, am planning to use Spark on a LAN, with Openfire already installed on a Windows machine, and other machines on the LAN having Spark client installed. How do I proceed with adding new user accounts? This is the first time am configuring

You can either add new accounts via Openfire’s Admin Console or your users can register new accounts via Spark. Check the Accounts button on the Spark start screen.

thanks