If you're using your secure device you may not want or need to log out of your account after each use. If you're using a shared device to access your Plenty of Fish account, however, logging out after each session is recommended.
Access the overflow menu, go to settings, and select logout to log out of the apps.
To log out of the website using a desktop computer/laptop, click on "My Profile" to see the menu and select logout.
To log out of the website using a mobile device, you'll go to the overflow menu, and under the "My Account" section, you'll find the option to log out.
Did you log out and now forget your password? You can request a password reset link by entering your email address registered to the account at https://www.pof.com/getpassword.