To make those changes you would need to make a child theme to not lose the changes when the theme is updated.
You would need to find which file has the loop in it, copy that to your child theme, and make the changes there. For info on the first change, here is a function reference for author. The second change can be made by just moving the code around.
Any idea how to find which file has the loop in it?
Do you still need help with it or have you figured it out?
You can learn more about the WordPress loop and how to recognize it here in the Codex:
http://codex.ww.wp.xz.cn/The_Loop
Finding the right file in which to add the author depends on where you’re aiming to make the change: on single posts, on the blog index, both? Here are some files you might need to work with:
content-single.php – for single posts
content.php – for the blog index
The way this theme is structured, these files are called in by other files, like index.php (blog index) and single.php (single posts), which are two of the files in this theme where you’ll find the loop.