Not able to sign in to iMessage.

Hello

When I try to access iMessage, I click "get started". Then it says enter Apple ID.

I enter my apple ID and password and click sign in. It then says, "People will

message you using your email address. What would you like to use?" I click

my email address, and then click next. It has a loading symbol next to the

word "Verifying" at the top of the screen. Then it goes back to "Enter Apple ID."

Can someone please try to help me?!?