Before you perform the iOS update, please make sure that you know your Apple ID and Apple ID Password. You may be asked for your Apple ID Credentials when setting up your iPad after the iPadOS update.  Your Apple ID Username is your SSO username and your Apple ID Password is your SSO password.

Check if you need to update your iOS by tapping:

Settings > General > Software Update

If you see "Your software is up to date", then you are on the current iOS and no additional action is necessary.

If you need to update the iPadOS on your iPad, the iPadOS update information will be presented and you will be able to tap "Download and Install" or "Install" to begin the iOS update.  You will not be able to install the iPadOS update if your battery is below 50%.  If your battery is below 50%, please connect your iPad to a charger and keep it plugged in.

Follow the prompts on your iPad to complete install the iPadOS update.

The iPadOS update will disable your iPad for 15 - 20 minutes while the update installs, so only perform the update when you don't need to use your iPad.