idea stream templates

I’ve a problem with the list of all ideas from all user, the page template broke my header from my theme, but is supported from the other pages ( new idea, my-ideas).
So I put on my theme’s folder like you suggest here:
https://github.com/imath/wp-idea-stream/wiki/Ways-to-customize-the-plugin-from-your-theme

so I put the structure of folders:
/wp-idea-stream/templates on my theme directory.
and then I’ve tried to edit the archive.php page, but nothin happen, it seems that the template isn’t used! where I wrong? or I’ve to edit some other page or parts?

Second wich one is the single idea post template to edit for showing some custom field ?

https://wordpress.org/plugins/wp-idea-stream/