Article: You can't change your password using the mobile app. It's in the upper-right corner of the window. If you use Facebook to log in to your Spotify account, you won't have a Spotify password to change, but you can change your Facebook password.  It's in the lower-left part of the window. If Spotify opened into a Web player, you may have to click View Account first. It's next to a padlock icon in the menu on the left side of the screen.    Your password will be updated.
What is a summary of what this article is about?
Go to https://www.spotify.com in a Web browser. Click Log In. Enter your username/email address and password. Click LOG IN. Click your user name. Click Account. Scroll down and click Change Password. Enter your current password in the top field. Enter a new password in the next field. Re-type the new password in the bottom field. Click SET NEW PASSWORD.