You can easily allow your members to sign up by adding a signup link to your navigation menu, or by adding a member signup button, or both. You can also add a signup link to your existing login form.
You can easily add a signup link to your existing login form. Just navigate to Membership > Forms, and toggle the setting that says "Include a Signup text on my login form". Then, click Save. Your login form will now display a signup link.
If you want to have a separate Signup form, you can add a Signup link to your site's navigation or a Signup button.
https://paidmembersapp.com/members/login
If you prefer to add a Login / Account popup onto a specific page of your website...
https://paidmembersapp.com/members/login