Is there a search capability for the rss feed or the documents on the app? thanks

The available features are listed on the Features screen (link at top right of screen). To roll an RSS search, you'll need to use an HTML screen or CustomURL screen with a text box + search button or something. Your requirements may or may not be difficult, it depends on what your searching, how you want to search it and how you want it to look and feel. Without knowing more, I would use a Custom HTML screen that held a simple form so the user could enter their search conditions. Then, I would do an HTTP Post from that HTML form to the RSS feed. This design would of course require that you controlled the RSS output so you could filter it based on the users input. I've not seen an RSS search function before, providing more details or an example of an app that has this may help us design a feature like this into future releases.

i was looking to do some searches like in a reference book example: http://itunes.apple.com/us/app/the-betty-crocker-cookbook/id373832848?mt=8

Cool cooking app, gotta love Betty Crocker. There are some sophisticated thing going on in this app, back-end database of recipes, pictures, information, etc. It will take you some time to develop this, even with skill and experience. As far as the iPhone goes, you'll end up creating some Custom URL screens to fetch and display the data. The URL for those screens will point to your server where you have the database of information. The tool on this site could certainly help with the organization of the front end but aren't going to do much for your backend database. Hope this makes sense. We wish you luck.