Hopefully you've heard the news that LinkedIN got hacked and many passwords were stolen. In fact a few hours ago LinkedIN Confirmed passwords were stolen! It's good advice to reset your password. When I first went into the interface to change my password I saw it was a nightmare. The interface isn't intuitive since it's all about your network. Hopefully this screenshot helps.
What you'll want to do is click on your name in the top right corner, choose settings, then click account in the left bottom, then under Email and Password you'll see the link to change password.
(Note: Clicking Profile, Home or More, doesn't help. You'll only find it by clicking on your name… Sorry if that's not intuitive.)
I do recommend making sure other accounts that were using this same password are also reset, and it's likely a good time to make your passwords not the same especially on your most important social network and BANK accounts. It's a reminder and a strong recommendation to consider strong passwords, but just assume these guys have your ID and Password and they're thinking about trolling about to see where else they can use your keys. If one key opens lots of doors…. They'll be very happy.