The output RSS feed results in at the top of every feed:
<channel>
<title>FeedName</title>
<link>https://zapier.com/</link>
<description>This feed is powered by Zapier's handy RSS service.</description>
I want to replace it to:
<channel>
<title>FeedName</title>
<link>mydomain.com</link>
<description>This feed is powered by me.</description>