One tip: Don't double post only 5.25 hours behind.
Well, have you googled for searching a database? Typically it means that you'd have to run an SQL statement against the database using what's in the $_POST array from the form.
The wildcard character for an SQL statement is "%". So a typical SQL search query looks like:
SELECT column1, column2, column3
FROM `table`
WHERE column1='%$_POST[userInput]%',
OR column2 = '%$_POST[userInput]%',
OR column3 = '%$_POST[userInput]%'