Show Select Category page instead of a drop-down in Add Listing

i am not able image categories in add listing i want to old i dont to use the dropdown menu how to change that

Please try this PHP snippet Enable the Select Category page (deprecated) in the Add Listing process #hivepress #listings · GitHub

where to add this i am not in developing field i dont know can u tell me the steps to add
sorry to ask u the process /steps please help i want to use old version which i like template by selecting it automatically get select the category

Please use the Code Snippets plugin to add and manage custom PHP code snippets Code Snippets – WordPress plugin | WordPress.org