So my boss wants me to edit the backend of his WP site so that he can add a video link from a site called vzaar, which hosts all of our content. I need to know where in the backend I can edit to allow this to happen. I dont need to know how to do it, just need to know what I’m looking for.
Here is an image of where he wants the option
It’s Post Meta Box / Custom Field. Try find it in functions files inside the THEME folder.