Displaying Additional Filter/Sorting Fields At Search Box.

Hello Everyone!

I am trying to display “Candidate Skills” https://awesomescreenshot.com/08d466qv70 at this page https://tutors.com.sg/find-a-tutor/ to display “Candidate Skills” as well as adding a drop down list that allows the user to filter/search via “Candidate Skills” as shown in this screenshot : https://awesomescreenshot.com/055466rb63

I tried following : https://wpjobmanager.com/document/tutorial-adding-a-salary-field-for-jobs/#section-4 but this is for Jobs section, not resume section and I can’t seem to figure it out.

Please advice.