If you need to change your password while logged into your account follow these easy steps:
While logged in click the Profile icon on the top right of the screen.
In the Profile Dropdown click Settings
Within the Settings Dashboard make sure you are on My Profile tab
At the bottom of the My Profile screen you will find a section labeled Password
Type in new password and click Change
Click Save
If you are locked out of your account and need to change password use this article titled: Reset Forgot Password