How to put my Wi-Fi password back on my iphone?

I have the iphone 4, and there was an update in my settings so I updated my phone and then it asked my for my Wi-Fi password, but I didn't put it in and just exited out because I have my password saved in my notes on my iphone so I had to go look at it and I went to the settings and i clicked on Wi-Fi and it still looks like it's connected to my network. But it has a lock on it and i clicked the arrow on my network and it just shows ip address and whatnot but it has no place for me to put my password in so i can actually use the Wi-Fi.

Oh yea I remember this you need to really be careful this is like a bug or glitch you really need to put the password at the chance you get. I never found out how to do this and I couldn't update stuff luckily I get my Internet from the satellite not my home I recommend you to just hookup out of the house it's the only way I hook up cause I don't need to put passwords. Of course Internet is free outside of your house.