First determine in which language you want to add the game instruction.

1. It must be a language that is already added to the website. If not, you need to add a language first.

Then, go to src/datas/markdowns/xx where xx is the language code as found here.

Inside src/datas/markdowns/xx/, create a folder named gameInstructions if it is not already there.

Inside src/datas/markdowns/xx/gameInstructions/, create a markdown file named yyyy.md where yyyy is the Game ID you get from the back end (It is case sensitive).

Now, update that file with game descriptions and instructions, and make a PR!