You can search by typing in the Query box and pressing the Query button. The query fields can be shown and changed by clicking on the Show query fields link. Currently, you can search based on experiment names, repository identifiers, keywords, researcher names, reagents, instruments, sample annotations, PubMed identifiers, and FCS headers. By default, all but the FCS header options are enabled (the FCS header option is typically not very useful and it slows down the search significantly).