Hi, a site asked me for an xml channel for reposting and I wonder how can I add Extra Fields by id at the ks rss link.

Hi. I don't get exactly what you mean. All K2 RSS options can be found under K2 parameters. There you can choose what you want to display in feeds.

My site is about calassified ads in my region and I need a custom xml feed for another site to read and post, throu it, my articles

My rss MUST have the following:
<job>
<link>
<name>
<region>
<salary>
<company>
<companyinfo>

So I am trying to find a way to pull out k2 "extra fields" in my rss..
is there a way or any aother way to customize me k2 rss?

Hi. This requires a custom implementation. I suggest that you hire a programmer to do it for you.