The following options are available to allow your customers to login to their Hosted Account Management page.
1. In your Recurly site on the left-hand side of the user interface, go to Configuration and Hosted Page Settings. Then, under Customer Access you can enable Account Login. This would then, present in each of your customers accounts, at the bottom right-hand side, an ACCOUNT MANAGEMENT URL. You can share this with your customer to automatically log them into their specific account.
2. With the Account Login enabled under your Hosted Page Settings, you can direct your customers to your Hosted Account Login Page (https://your_subdomain.recurly.com). There they will have the option to log in to their account. The catch with this option is that if this is their first time accessing the hosted login page you will need to have them hit the "forgot password" option and they must have an existing account in your Recurly site. This will essentially get them their password to log in.
3. Additionally, your Recurly emails can be customized with the account_hosted_maintenance_url parameter. This places the Hosted Account Management Login Token URL in the email that the customer can click on to enter their account directly.
More about our Hosted Account Management pages here.