To add a Subscription product go to My Products, click on the Add Product button and then select Subscription 
.
Now the product wizard will open to allow you to enter product details.
The product wizard opens initially on the Overview page.
There are many more functions available to you by clicking on the links on the left side.
Compared to the Physical products overview, subscriptions have some additional settings in Overview.
Here you enter the specific settings for these product types.
Set up fee: this allows you to charge a fixed set up fee to create an subscription account for a customer
Subscription terms: enter the regular price for the subscription and define how often it has to be charged, for example $10 every 1 month.
Enable trial period: this allows you to provide an initial trial period to your customers for free or at a discounted price. Tick the box and enter the settings for the trial period.
Check out Physical products for product features and fields not explained here.
