By "either", we just mean that you need to type something into the form, or else you'll get a "Search Failed" error message. You can specify both "Arbitrary Text" and all of the other fields, if you want to. It can also be useful to type in multiple words in any of the fields; this means that you want to search for any of the words (i.e., it is logically an OR rather than an AND). The maximum total number of words that will be used is 8. Words should be separated by spaces, although any non-alphanumeric characters except - and ' (hyphen and forward single quote) will also be considered delimiters.
Please report problems to email@example.com