I've changed the location and mechanism for searching the site (for desktop browsers, no change for mobile browsers (for now)). Previously, the field showed in the top right of the screen, waiting for you to type in your search keyword(s). The field disappeared when you scrolled down, so wasn't easiest to access. Now, search is still located in the top right, but moved to the magnifying glass icon near you name-conversations-alerts icons. And remains when you scroll down. Click the magnifying glass to expand the quick search field to type in your search keyword(s), or click the gear icon on the right-hand side to expose the full search criteria.