Job Filter

Hello,
I am having a problem with the plugin “Simple Job Board”. Actually there is Three job search field here “Category” “Type” “Location”. I want another search field here, That will appear in the front end. When The visitor will search jobs using this now option it will work like the first three and Not only that, I will get a option in the back-end like when in Post a job I select the category and job Type, etc. When I am going to create a new option here, This option will appear in the back end And I can select that from the back end, And when user use this keywords they can find the perticular job using this keywords.
Thank You