At admin/build/block you can configure the individual forms.
Apart from the title/description, the block config has four sections:
- Finder Form - settings that control the Forms API properties and ultimately the HTML code of the form. Options include form type, form labels, form sizes, etc...
- Possible Choices - settings that determine which nodes (e.g.: content type, taxonomy, etc...) can be found with the forms, and upon which fields/terms to search.
- Processing and Results - settings that determine what happens when the form is submitted. Options include validation and results page.
- Append Finder Forms - allows you to combine multiple forms into one block. Results page will be filtered by all forms in the block.