How can I Auto reorder product when i choose only date of shipping in Magento frontend? [duplicate]

Question

This question already has an answer here:

• Recurring Profiles - How do they work? 1 answer

Users can re-order without the effort of re-ordering. Enter the date of every month when you want the products to be shipped in Magento.

Any idea, please??

How can I use recurring profiles in Magento??