And I'm just the guy to lecture people on the evils of taking back a move.
The OP said we were to discuss it, so......... 🙂
Don't do it or allow in an OTB game even friendlies it encourages
very sloppy thinking and is against the rules.
Here however. You can play your move on the board.
Look at it very carefully to see if it is a blunder.
If it is you can take it back and choose another move.
Before you 'send', you can take back as many moves as you want. That is OK.
The time to 'Take Back' a move was here in your game v Lord Shark
played in May 2010. Game 7434598
In this position with you White to play.
You castled Kingside.
Taking back that move before your pressed 'Send' would have been a good idea.
Guess what Black played to bring the game to a sudden end. 😉
You could have set a wee trap here instead of castles King-side.