to update my iPad

You can follow the steps in this article to update your iPad to the latest version it supports:

Update your iPhone, iPad, or iPod touch - Apple Support

Keep in mind that depending on which device you have, you may not be able to update to the most current version of iPadOS. You can find devices compatible with the latest version (iPadOS 14.7.1 as of this response) here:

iPad models compatible with iPadOS 14.7 - Apple Support

These are the instructions:--> Update your iPhone, iPad, or iPod touch – Apple Support

Regards

Giulio