uhh you just right click the move and and select add comment before or after
How to write comments
Oh I figured it out, It's because my computer doesn't have a right mouse button and I had to double tap the mouse pad instead. Thanks for the help!
I suggest you use outside software for detailed analysis. Download pgn file from here and load it in that software(I use pgn chessbook), and finally analyze the game. Then if you wish to show the game here, you can do it easily with "insert chess game or diagram" option in the message.
If you need more details on how to analyze your games, you may find everything you need here:
https://www.chess.com/blog/nklristic/how-to-analyze-your-games-first-steps-to-chess-improvement
For some reason it doesn't let me right click on them to get more options. Is it because you need premium to do that, or is it just not working because I'm on Chromebook?