How does the Finder app on my iPad work?

You can search for files using the Files App - or for Mail from within the Mail App.

Global searches across your device and iCloud can be easily achieved using Spotlight or Siri search.

Search with Spotlight on iPad - Apple Support

Find out what Siri can do on iPad - Apple Support

The iPad User Guide is a rich source of frequently overlooked information about your iPad and iPadOS. The Guide is available both online using a web browser (such as Safari):

iPad User Guide - Apple Support

The Tips App, installed by default on all new models of iPad, provides a brief introduction - and leads you to the User Guide. In case you missed it, here is a link to the Tips App:

https://apps.apple.com/gb/app/tips/id1069509450

Apple also has a huge YouTube Channel - containing videos and feature guidance:

https://www.youtube.com/user/Apple

Finder is an App found on Mac - not iPadOS.

What, specifically, are you attempting to achieve with your iPad?

Reply to ApSup975

Finder is exclusive to iMac desktops . On an iPad > settings > there is a search bar above your name , try it to find items on your device .

Additionally , iCloud would contain mail & files .

🔦

You're very welcome.