I'm new to Wordpress and I have some background in PHP and programming. I installed a Wordpress theme and some plugins which all work fine. However, on my Post page, I have 3 plugins being displayed one after the other at the end of the blog post.

Now, I can't seem to find how those plugins "decide" to be in that position the are in. Let's say I have the 3 plugins A, B, C in that order being shown by Default. In which file to I go to show them as B, C, A?