You can search on any field that the database contains. The displayed fields are only the most common.
Select this if you have more than one person with the same name and or birth year.
Select this if you want to know if the person married or if you have more than one person of the same name and you know the spouse's name of the individual you want.
Use the least number of parameters necessary to select the individual you want. However, if you are searching a common name Mary Hoisington, but do not know if she may have a middle name listed, use both Last Name contains Hoisington AND First Name contains Mary.
Do NOT search for "Hoisington" when all you want is all the William Hoisingtons as there are many William Hoisingtons and thousands of Hoisingtons.
If you are searching for someone with a First Name like Will, use First Name contains Will, as it may be listed as William, Willis, Willie, Wilhelm, etc.
When looking for a group of individuals, start off with the most common feature of the group that you are researching. For instance, if you want to know who was born in Windsor VT between 1800 and 1820, you would select Birth Place equals Windsor AND Birth Year equals +/- 10 years from 1810.