You can now enable recurring payments [subscriptions] for a merchant from whom you want to purchase products or services.
You can only do this for merchants who are using the Billbitcoins payment processing services.
The merchant will need to send you a recurring payment request from their BillBitcoins merchant account. You will need to approve this request by going to View payments requested by merchants or subscribed by you on the merchant websites tab.
You can also visit a website for a merchant using Billbitcoins and displaying the recurring payment form. You can fill out the form on the merchant website and send a recurring payment request to yourself and enable the request by going to View payments requested by merchants or subscribed by you on the merchant websites tab.