To use the Hubble and Webb Observation Planner tool, simply go to the website and select the telescope you want to observe. You can then enter a date and time, and the tool will show you what the telescope is observing at that time. You can also click on the "Future Observations" tab to see what the telescope will be observing in the future.
The Hubble and Webb Observation Planner tool is a great way to learn more about the universe and to see what some of the most powerful telescopes in the world are observing.