gmail offline

My gmail and iMessage have gone offline. Probably because I was messing around setting up a wireless device.

Gmail keeps asking for my password but when I enter it and hit "next", it sends up a blank pop-up asking again for my password but it is just a blank grey pop-up with no space to enter type. I have tried to solve this but fear that I may cause more problems! Help would be appreciated. Cheers, Jay Pegg