Navigate to your profile page by clicking your profile picture or name in the top right corner of your screen.

You'll see a box on the top of the page with your profile photo, name, and some basic info. Just below that on the right side, you'll see a link that reads "Reset Password" in blue letters. Click there to reset.

Your new password will have to include at least: 1 uppercase letter, 1 lowercase letter, 1 number, 1 symbol, and 8 or more characters altogether.