Only your instructor knows what she means by simulate. I would ask her or better yet, you tell her what you propose to do. Make sure you can do it, then do it. 
- you can create an 'order page' where you select from a pretend menu. Perhaps use Buttons with images of the food to order which automatically creates the 'order' Include a time to 'post' the food order (let the user select a time using a TimePicker) to 'release' the order to the web page.
-store the order in a TinyDB or on a Google spreadsheet (see link below for an example) - show the linked food service page at a simulated time You can link to the food provider web page using the Web component to display their Web page... but you cannot transmit the data to the actual server so a better solution would be to create a Pizza Party type simulation...see below
- provide a Notification saying the order was made and will be executed at 11:30 or whatever.
-etc.
Use your imagination.
Here is a version of the old MIT Pizza Party app using Google Sheets that simulates ordering from a pizza restaurant Built In Google Sheets Component for App Inventor by Tim . You can use that for ideas about how to simulate UberEats web page.