I am developing a simple ranking plugin. Every post has it's own like count, and these counts are saved as custom-fields.
The problem is, no matter how much i research, i still couldn't find the proper way to manipulate theme's design in order to display post meta as i like. I've found some methods about changing theme's content.php file but it doesn't make sense because i want this plugin to work on every theme. Also in wordpress codex, it's told that i can do this by using template tags in the loop however index.php page which i can customize loop in, is not also included to my plugins directory.
What should i do in order to display post's ranking meta properly for all themes ?