Please,

What I'm looking for is to be able to show as a CB user Tab an RSS info picked from another site and/or component

Looking around I found this topic, but really don't understand if this is what I'm looking for and where follow the plugin development:
www.joomlapolis.com/component/option,com_joomlaboard/Itemid,38/func,view/id,7645/catid,13/limit,6/limitstart,0/
Please, Do anyone can help me ?

Can it work also if I yet installed on my joomla this extension extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,64/Itemid,35/ ?