Cant Find Database Key on Advanced Search Fields

Hi, I have added some custom fields to listings besides phone and url which were already available. Problem is i cant use these while setting up advanced search. I have already created a couple of dummy listings that utilize these fields as suggested by a lot of people here. I am using version 8.8 of business directory theme. Phone and Url option can be chosen from the drop down but fields that i created are no where to be seen.
Any help would be appreciated.

Thanks and regards.