There are a couple of options available to change the behavior of the registration prompts.
Option 1 - Page Options
You can select the Page Options when using the website editor
You can select between: Not Shown, Prompt Only or Required on any page on your website.
Option 2 - Detail Page Options
On the property detail page, you can also adjust when registration is prompted or forced.
You can choose how many different properties a visitor will see before they are prompted or forced to register.
Then you can choose Force Registration or Allows User to Close the registration form.