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can"t login on my account from my iphone

i recently got an iphone and ever since when i try to login on my instructables account i can't. i tap the login button and nothing happens, even when i tap the sign up button nothing happens. i use to have a samsung and didn't have this problem. i have tried to uninstall the app and reinstalled and same problem. 
my iphone is a 5s with the latest update. 


Don't use rotten fruit products ;)

Did you try it through the browser and if so with the same negative result?