Once you have chosen a content management platform, you can use it to distribute your podcast to multiple channels by following a few steps. First, create an account and set up your podcast profile with information such as your podcast name, description, cover art, category, and language. Next, upload your podcast episodes and edit them as needed. You can use the platform's audio editing tools or upload your own edited files. Additionally, add metadata such as titles, descriptions, tags, and timestamps to each episode. After that, publish your podcast episodes and generate your RSS feed; the platform will create an RSS feed for your podcast which is the file containing the information and links to your episodes. Finally, distribute your podcast to multiple channels; the platform will automatically submit your RSS feed to some of the major podcast directories and apps while you can manually submit it to other platforms that are not supported by the platform. Instructions and requirements for each platform can be found on their websites or help pages.