There is a Quick Search option at the top of the page where you can type in a keyword. There is also an advanced search spyglass at the top under More (on mobile devices in the drop down menu) and at the bottom of the page where you can tailor your search more specifically to a member, post, thread title or forum and time range. In addition, there is a search box for both options below the Twitter feed. Please note you can only do one search every 30 seconds.