Question about the arduino + router article?

Question

Arduino

good evening! help someone in the subject! I want to assemble a robot from here
, but since I'm a beginner, I have questions!
one . The author did not indicate to which pins of the MK to connect the contacts RA0 / 1/2/3 from the engine driver! tell! I didn't understand anything from the code.
2. Which of the sketches should be uploaded to MK? He has 5 of them! what is the PDE file for? if sketches go to INO???
3. Now I already have a machine from here , can I adapt it for control via the Internet? what needs to be changed in the sketch?
4. he wrote that index.html
serial.cgi should be replaced. but where are these files and how to replace them did not write! help me please! and do I need to change them if I already have such a web? that is, there are buttons for controlling the machine !!
thanks in advance!!!

Answer 1

1. Well, look at the driver datasheet, learn to understand the code
2. PDE old format, INO new, rename.
3. you can adapt anything, you just have to start to understand
4. on the router