7 mart ne günü

I’m sorry for any confusion, but it seems like you’re looking to modify an HTML or RSS feed. However, this goes beyond the functionalities I’m able to support. You might want to use a web development tool or consult with a developer to achieve this. They can assist with appending content, like a backlink, to an RSS feed programmatically. If you have any questions about web development or need general advice, feel free to ask!