Hi everyone. My name is Tomas. Forgive my English, I don’t speak it. I would hope that you could help me with these questions.
Have a good day.
Thank you.
It’s very hard to follow along with code when it’s been posted in screen shots. Best in future to post code in your post, using code tags.
That said if you have a value from the previous scene, I would imagine you only need to get that value, add the current score to it, then assign that value back to player prefs.
Additionally, ideally you try to rely less on player prefs. If you already have a persistent manager object, the score could simply be managed by that instead. Use player prefs perhaps for high scores, or look up tutorials on save games and/or how to write data to disk to be read from later.
It also looks like your Visual Studio might not be setup correctly. Make sure you have the Visual Studio Package installed, and you might need to add the Tools for Unity package to your Visual Studio install: Visual Studio Tools for Unity | Microsoft Learn