i dont know how to connect to a wifi on an iphone if i forgot the password

Forgot what password?

• The iPhone passcode? If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support
• The wi-fi password? You cannot connect to this wi-fi without its password.

Which password? The passcode to access your phone or the wireless security password for the Wi-Fi network you are trying to connect your iPhone to?