The area you are trying to change is called "postbit legacy" If your info was horizontal, above the post then it would simply be the "postbit" but hopefully you are already aware of the difference.
You need to edit your postbit_legacy template to add boxes and whatever other HTML code to get what you want. There are instructions for adding boxes here:
https://vborg.vbsupport.ru/showthread.php?t=231125 - Note it's for 4.0 but I don't see any differences why it shouldn't work on 3.x
Alternatively you could search for "postbit legacy" mods and see what is out there.