Don’t. Not till they fix it. I did, and have now had to restore to a much earlier version, as my Safari won’t let any links work. I get what’s up on the search page, and that’s that. Even with Apple Support, I can’t click on the ‘lets get started’ or whatever that button is.
I chatted with Apple Support on my Mac instead and am now hoping that this restore works. If you didn’t back up before the upgrade, you will just have to wait till they fix it.
Ipad air 2 now is a glorified solitaire game player…..