There are many detailed videos on YouTube about the RX 2/3. Here is one that should get you going:
I own two of these and normally use them in the 2 battery mode. I occasionally use them in tc control with 316L ss wire on various rta's. That video should cover what you need to know. I only use the software version for 150w. I would never have use for 200w. On their website you can download the latest version for 150w or 200w as you choose. Very simple to install in seconds.