how to locate my iPad on my desktop

Use any internet browser and log into www.icloud.com/find

Also see the following Apple articles for information about lost or stolen iPhones or iPads: Find your lost iPhone or iPad with Find My - Apple Support and

Find your lost Apple device or AirTag with Find My - Apple Support

If you enabled Find My app on your iPad and if it is online, you can open your laptop browser, go to https://www.icloud.com/find , and you should be able to locate it.

Regards

Giulio