I am saying you just have to change your files with the changes shown on those pages. Red lines mean take it away, green lines mean add it in, white lines are just for referencing the location in the code because the line numbers might not be the same if you are on a different version.
You can basically double click the green lines to select them then copy it and paste it in place of the red lines which you should find in your code. There are only 3 or 4 files changed and maybe 6 or 7 lines total to change and a few to add into the css at the end.
If you want more help then that feel free to email me your info. Don’t paste it on the forum.