Save.txt you are typing manually?
i try like this
but txt inside nothing was after saving
I have no idea what you mean.
You tell it what you want the save file to be called. (in this example save.txt)
Then when you want to load that the item that you have saved, the tag name you gave it, use that tag name again on the Load action.
The screenshot I gave you shows what you would need to do to save an Int, and restore the int.