Search is located in the upper right corner of the screen, otherwise you can also access the Search page directly at https://community.nintex.com/search. From here you can filter by content, people, places, as well as time frame, and type of content.
A few IMPORTANT TIPS:
Results appear dynamically below the search box AS YOU ARE TYPING. So, don't be too quick to click the "enter/return" key. You might see what you need right away.
If you click "return," you'll land on a page of filterable results.