['siteurl'] question. Editing RSS in index

[cowlishaw]

You guys I'm trying to get the feed to point to my brother's URL (domain) entries rather than under my domain. He has an addon domain, but in his feed keeps pointing to talkingtree.org rather than joecoleslaw.org. How can I edit the ['siteurl'] to point to his domain and therefore his individual entries?

Thanks in advance...

[GeoS]

Put URL to feed in templates files manually. Thanks to such solution you can set it where you what.