Question Checkpoint in 2D

I need to make Player When dies respawn at last checkpoint but its respawn from beginning and ignores the checkpoint(I already have script for making object get "green" when the Player Interaction with it) I have scripts already made and iam new toc# so i cant edit it so when i see a tutorial I cant merge my script to tutorial script so i need help figure out how to merge it correctly.
This is the code that I think should be merged