Interests are a useful tool to tell the Community what you like. They help you connect with like-minded people and some Members find this very important.
To add Interests to your Profile:
Place your mouse pointer in the top right corner of the page and on the drop down menu that appears click on Edit Profile. On the resulting page click on the tab Interests.
Check only those activities you really feel close to. If you feel extremely passionate about something, put it down under the Especially Passionate About section.