How to correctly write a unary operation command for activation through a button in a cell?

Question

Google Apps Script

Hello and I apologize in advance if this question becomes too stupid. Not at all, I looked through a huge number of examples and tutorials and could not find an answer, so I need you. I have a regular calculation table and the numbers are in a column, but they vary by units. I made a button and started trying to start the activation of the script through a click, but I constantly get an error, whether it's adding or decreasing a number. Can anyone help or give me a direction to go. Thank you in advance for your attention and help.

Table Example