I’m trying to update my iPad , but i can’t?

If your device won't update, make sure you are following all the conditions for the method you are trying to use. If you are sure you are following directions correctly, try a different method.:

Update your iPhone or iPad - Apple Support - wirelessly*

Update iPadOS - Apple Support - with a computer

If your Apple mobile device won't update, read this support article for a list of possible reasons --> If your iPhone or iPad won't update - Apple Support

Another, less common reason for not being able to update is if you were using a beta version of software. Refer to How to uninstall iOS or iPadOS beta software - Apple Support

If you need more space for an iOS update read this support article --> If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support

If your update feature on a device is greyed out or restricted, it may have been disabled using Screen Time, or by an IT administrator if you are using a device owned by an employer or educational institution. Read this document about using Screen Time on an iPhone, iPad, or iPod touch --> Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support

Tap Settings > Screen Time > Content & Privacy > scroll to Allow Changes.

You need to provide some relevant information if you need help. In the absence of that information, I am posting a link that might be helpful.

If your iPhone or iPad won't update - Apple Support