The easiest way to start subscribing to channels is to browse through Awasu's channel packs. You can do this by choosing the Channel packs option from the File menu.
Channel packs are sets of channels that have been hand-picked because they contain high-quality, interesting and useful information. Just open a pack and browse through the channels it contains. You can preview each one and subscribe to the ones that you are interested in.
Radio Community Server keeps a list of some of the most popular RSS feeds on the net [here]. Just drag any of the orange XML buttons () into Awasu's My Channels window to start the Channel Wizard. Or you can copy the feed URL yourself and paste it yourself into the Channel Wizard.