The search box is located in the top-right corner of the page. Type a term in the box and press Enter. Your results will be listed as pages sorted by relevance (based on the number of hits). When you click on a result, you will be directed to that page where your search resulted will be highlighted.
Each major Open Mobile product has a home page with a list of general help topics. You can navigate to these pages at any time by clicking on the appropriate tab at the top of the page.