I can't sign into Apps Store after changing my apple ID
i just changed my Apple ID and now I can't access my Apple Store or Update my Apps on my IPhone. I tried logging into my Apple Account in the Settings menu. The account verification shows my proper ID, but when I put in the password, it doesn't recognize the Password, just clears the screen then asks me for my password again. Please help.
iPhone 4S, iOS 8.1.3