So I watched this video: https://m.youtube.com/watch?v=TI55AMr0fK4

I actually have Blender version 2.79, but seemingly that doesn't affect the process the video is explaining.

I followed along with the video's instructions, so now all of the bones are in the correct places, but they still don't move the character.

How can I fix this? Does it have to do with the version of Blender that I'm using?

Also, any other suggestions to fix this problem are obviously welcome.