To update general account details such as name, email address etc, just hover over (desktop) or tap on (mobile) your avatar in the upper right corner of your dashboard and select "Your profile":

The new page will open up automatically on the "Your profile" tab:

Here you can edit your name, email address, time zone, upload or change your avatar, and further down the page you can update your password. 

Remember to click "Update details" when you're done.