I have an iPad . It says update safari. How.?

Safari is an integral element of iOS/iPadOS - and cannot be updated independently of the OS via an App download. If your iPad has been updated to the most recent version supported by your iPad, then Safari is as up-to-date as is possible.

However, some websites incorrectly identify your iPadOS Safari User Agent when used in one or other of its browsing modes - of which their are two - these being Desktop and Mobile.

It’s easy to switch between modes if a website isn’t functioning correctly. From the desired web-page, touch the aA icon at the left of the Address Bar; this will reveal a menu. From the menu select Website Settings, then select (or deselect) Request Desktop Website, then tap Done. Now refresh the webpage.

The chosen setting will be saved for the selected website - and can be simply reversed if needed.

Updates for apps on an iPad including Safari are in the ‘App Store’ either by clicking on your profile name and checking for any updates or searching for the app. You can also set apps to automatically download updates through Settings > App Store.