Adding custom fields

Hello,

I’m stuck adding custom fields to the submit form. I’ve tried following the documentation but it isn’t clear to me. For example,

//Copy one of the existing forms to the template directory
//Add get_post_meta to the form php form file to retrieve the values of the custom fields
//Add the custom fields to the form
//Add update_post_meta to the frontier_post_post_save action

1. Which form should I use? is it frontier-submit-form or frontier_post_form_standard
2. What do you mean add the custom fields to the form?
3. one of my fields (key) is named distance as an example

https://ww.wp.xz.cn/plugins/frontier-post/