Password protect a page using AAM

Hi,

I am wondering if you are able to help me with something I am struggling with.

I am designing a website for a client who wishes to have a newsletter archive. However, they are not wanting visitors to be able to access this until they have filled in a membership form and gained a password.

Therefore, I would like to know if it is possible to password protect a page using AAM, and how you do it.

Thanks in advance.