Appian Site Login

Hello people! I hope you're doing well.

Is there any way, video or documentation, where I can learn how to create a login page for my Appian ACME (Community version) Site? 

For example, there is my site link like this: 

But looks like an Appian login, not the ACME or my site custom login page. 

Question 2, this means that if I create a user in my Appian ACME site that user will be allowed to access to the ACME Site?

Thanks in advance! have an excellent day.

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