How to scrape after submit

How to?
#1

Hi,
I need to scrape the page in this order:

  1. Check all checkboxes in a form
  2. submit the form
  3. then scrape the data

I can't figure out how to do the first 2 steps. I've tried to check all checkboxes and create a delay before submit, but it's not working. How to do that?
Thank you