i need (add and delete) functions in a table thats already developed

I have a table in my website that displays keywords based on the industry the user chooses from the drop down list above the table for example : if you click on beauty industry a punch of keywords related to that industry will be displayed. this is already DONE what i exactly need is 2 functions that i can use on the table: 1-a function that enables the user to delete a specific keyword i click on 1- a function that enables the user to add a keyword by submitting a form that contains (keyword name and the industry the keyword will be related to ( a drop down list that contains all industries retrieved from firebase ) note: delete code already written but i dont know why its not working (its deleted in the front end but when you refresh its back)