The Physics lecture prep site is designed to be very easy for lecturers and instructors to navigate. The video above is a nice walkthrough of the site, and the above link is to the lecture prep site itself so you can bookmark it and explore it at your own pace.
If you prefer, you can use the slideshow below to flip through the demo request function and learn how it works:
Main page of the Lecture Prep Site. From here we are going to click on “Thermo” and see what demos we might want 
We are now looking at the Thermo page. Let’s click on the Bimetallic Strip demo and see if we like it. 
The Bimetallic Strip is a good one for us! Let’s scroll to the bottom of the page to make a demo request. 
At the bottom of the page there is a large green “Request Demo” button. Click on it and it will pull up the demo request form. 
You will select your name from the dropdown menu, and once you do it will give you options to select a date and what class it will be for. Then your request is done! 
In case you have a custom request to make that doesn’t match something on the site, you can click “Custom Request” at the top to submit one. 
Finally, in the off chance that the demo request form isn’t working, there is a more manual form that you can use where you put in your name, class, the date needed, and the demos you are requesting.