Edit search function in Joomla Site

My Joomla site is using a book list component. I edited it to add a few more fields. The fields are in the database and also in the search form, but I don't know how the search function works and I need to alter it to include these new fields. I need someone to log on to my computer (using team viewer) and show me how to make these changes. Below are the details of exactly which fields will need to be changed. Page: [login to view URL] Field <input type="text" name="keyword" id="keyword" size="20" maxlength="50" value=""> also needs to search the ISBN field in the database. In the database this field is called "isbn" Field <input type="checkbox" name="bl_new_book"> needs to search the database field "bl_new_book", if that field contains "-1" then the book should be included in the results Field <input type="checkbox" name="bl_dll"> needs to search the database field "bl_dll", if that field contains "-1" then the book should be included in the results Field <input type="checkbox" name="english_only"> needs to search the database filed "bl_dll", if that field does not contain "-1" then the book should be included in the results If there are any questions about the project please let me know. I am familiar with Joomla, so this should not take very long.