Hi Anita,
The Y number is the position in Y axis of the page, for example: The beginning is 0px.
You do not need to change the number, only if you want. This number is the position in Y of the page, 0 is the beginning, so when the page achieve the position in Y = 1500px, the page will create the captcha element into the div with the class “captcha-box”.
If you want to change this number, you can to your website in the browser, right click with the mouse, go to inspect (if you use safari, google how to open inspect), then click on console, go to the part of the website you want to create the captcha and then type on console: window.scrollY - it will show you a number, then if you want to show in that Y position you change the Y inside of the if from 1500 to this number.
Console is inside of the inspect when you click with the right click on the page and go to inspect → console
Yeap, you can delete the recaptcha, because the code that I wrote will create to you automatically. but, remember to create a div withe the className of captcha-box on the place