The error says it all.
cognitoidentityprovider.SignUp isn't defined, because there is no symbol
SignUp exported by the
I'm not really sure what you want to do instead, since I'm not familiar with that SDK, but you're trying to call a function that doesn't exist. I suggest re-examining the documentation or example you're following. You've probably made a simple mistake.
You seem to be confused by the CognitoIdentityProvider.SignUp instance method. But as that's an instance method, and not an exported function, it requires an instance of a
cip := cognitoidentityprovider.New( ... ) _, err := cip.SignUp(input)