Currently, we don't have a member registration and login feature yet, but we hope to add it in future. We know that many people would like to have people register for accounts and have logins for their sites. We will need to do quite a bit of development to make this possible, so we can't make any commitments about if or when this feature will be released.
In the meantime, we recommend Caspio to create your membership service. They have a detailed, step by step video tutorial on how to create and integrate this into your Yola website.
Caspio offers a 14 day trial period. For additional pricing information, you can visit this page: http://www.caspio.com/pricing.
Alternatively, you can password protect pages using our Password Protection feature, which allows you to create a private website, or make part of your site private, by password protecting certain pages on your site. Take a look at the Password Protection tutorial to get started: Adding Password Protection.