You've always needed to log in to ask a question on this site (otherwise your name couldn't be attributed to a post).
However anyone can search the site for existing answers, irrespective of whether they're a member or not. If that's what you were doing (and what still want to do) the search box has now moved to the top right of the page, above 'Latest Posts'.
At least, that's where it's meant to appear. Apparently it doesn't on some devices! If you can't see it there, simply click on 'View All Categories' and you'll then see a search box above the list.