Problem: You go to a coffee shop or other wifi network that's password changes often. You try to log on, but the password has changed. There is no new place to enter the password.
Solution: Turn WiFi off. Go to Advanced Settings. Click Manage pre-existing networks. Find the network that you wish to connect to. Click on it. Then click forget. Go back and turn wi-fi back on. Connect, it will now ask you for a password.