There are two variants of Buyers’ registration: they can register themselves on your website front-end and admin can register them via admin area of the website. First of all, please, make sure Buyer role is activated in Estatik settings.
Option 1. Register on site
Make sure that you created page with shortcodes [es_register], [es_prop_management], [es_login], [es_reset_pwd] and added them to the settings (Estatik>>Settings>>Account). When opening page Register, i.e. [es_register] you will get the form that you or buyer must fill in to complete registration.
Once you've registered, email with Password generation link will be sent to your email box. When you click on received link, you will be offered to generate the password like it is displayed below:
Once your password is successfully created, you can go to Login page and enter your credentials to log in.
Option 2. Add Buyers via admin area
Enter your website admin area, click on Add new Buyer and fill the form with Buyer`s data.
if you can see the message like below, everything was done correctly and you will receive email about new registration as well as Buyer will receive email with access credentials.
You can see new Buyer in the list of your other Buyers: