Adding Create button in popup window

After I I related a field in a page to Bugs. An arrow appears on the side of field When clicked it shows a popup where we can search the created bugs. How can I put a create button in that popup like in customer popup?

Are you a developer?

For some reason, it is missing a “create” element in the array here

You can see an example here

I am developer, Can you guide me which files to edit and what code to add?

Yes, edit the first file linked above (well, make a custom copy of it)

and add code similar to the second file linked above (“create” element) - but you will have to find out the specific values to use there, I don’t know them exactly…