I see you created a new project with sime improvements, so I will focus on what is missing only.
You need to create a double variable. Call it as you want. This is how variables are created:
https://fxdreema.com/instructions/builder/constants-and-variables
Then you need to insert that same variable here:
0_1582831241530_01.png
And here:
0_1582831253294_02.png
That would do the job. However, remember that that variable will double lot size to the infinite. You will need a condition to restart it to 0.