I am just guessing but your phone is trying to tell you that you need to "Log into" the local WiFi.
Your WiFi Bandwidth is yours, my WiFi Bandwidth in mine. If I wish to let you use some of my bandwidth, you will need to ask for the password and enter it. Many people will charge you for using their Bandwidth.
Some will allow to do so for free!
Using other peoples WiFi Bandwidth is very risky. It is not as secure as yours is and you are at risk of having a third party reading the contents of you phone. You would be well advised never to even consider using other peoples WiFi while doing your banking or any other financial transaction