P2P Movement, synchronization

I am trying to make a multiplayer game, I looked up on the YouTube and forums, and found some useful information, but I got stuck. The character doesn’t load up on the second preview, also I can’t seem to find a way to move my character, since I have just one controls arrow keys, and I would like to have same controls for all players. At least the connection works, I was able to connect the way that demo shown.

Here is the whole main code, yes its a lot, and mess, sorry.

Video link :

Thanks for considering this problem.