Obviously, change Canopy to whatever you want your community string to be (commStringRW applies to SNMPV2, and rwUserName applies to SNMPV3, so you don't necessarily need both), and change the 16 to whatever power level in dB that you want to set the transmitter to.
From cnMaestro, if you navigate to one of your radios, then click the "Configuration" tab, near the bottom is a link for "View Device Configuration". If you click that link, you will get a popup which contains a template file for the current radio configuration, and should contain all possible variables that you can configure:
You can download that file and then remove anything you don't want to configure, leaving behind only the things you do care about. You just have to be careful to maintain the structure of the file with respect to nested elements. For example, if you wanted to set the ping watchdog shown above, you could use a file like: