So, your scenario is that your example image shows a page that you maintain, and you are not able to change the source. Ok, you need two steps: a trigger to start doing something once the page is loaded and some code to push the button.
First, add a class or id to the button. Then you can add a microflow timer and set it to trigger a nanoflow that starts a javascript that presses the button. Or just skip the button and trigger the same action that the button triggers.