JS Inject

Automatically run script? Double click on run?

Hello:

Here is my script for execution at https://online-go.com/

document.getElementsByClassName("ogs-nav-logo")[0].remove();

After adding this script I must double-click "run" to remove the logo. Should I have to click "run" twice before it executes the javascript?

Next question: is there a way to automatically execute the script on each page load?