We've been working on ways to make the search easier for people to use. One of the sources of confusion has been the name of some of the profile fields, so we have made some changes.
The field I am a is now Member Type
The field Offering/Looking for is now Donation Category
We've also added some links to the help articles on how to use search to the search page, and updated the articles to show how to use the Location field and saved searches.