Hello everyone, I am creating a panel for quick opening and closing. Buttons "Buy", "Sell", "C Buy" and "C Sell" work correctly. I have a problem with the "+" "-" buttons and the "Lot_size" display window. How to code blocks so that after pressing the "+" button, it adds Lot value to "Lot_size" (similarly with the "-" button) and displays the current Lot_size for the next Buy or Sell opening on the chart.

https://fxdreema.com/shared/xwJAmeCsd
Either I build blocks 42, 43, 43 incorrectly, or the error is in blocks 49.50, or maybe I should use other blocks?. If you can, please help.