How to change the post thumbnail size?

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So while trying to learn Worpress, I decided to try and alter my blog in order to gain experience. So the basic theme I have does not seem to have basic post-thumbnail support. I uploaded all the files of the theme here: [https://github.com/xVicissitudex/WordPress-Themes])

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on the functions.php on line 145 I see this:

// Enable support for Post Thumbnails, and declare two sizes.
add_theme_support(‘post-thumbnails’);
set_post_thumbnail_size(1600, 9999, false);

but that’s really all I see about thumbnails, I tried to find The Loop so I could insert set\_post\_thumbnail and play around to see what it does. But in index.php there is no Loop I can see. Just hooks that call functions and I can’t see where these functions are defined.

What are my first steps here in order to set thumbnails of a specific size for each post?

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