First, try and write more meaningful titles please.
Seconds, problem sounds easy enough. Have a text to input the string to be searched for, a pull down box might be enough to select a field to search in, post this via a form to a page, and construct a query from that!
In SQL the query would be something like "SELECT * FROM $field where $field=$search_term".
Want specifics, google it! Plenty of HTML tutorials for you to read, and then maybe you could ask a more specific PHP question!
HTH
glj