For technical reasons, it is not possible to have more than one auto-renewal subscription on the same account.
If you already have a monthly or yearly subscription, only manual 1-year payments are available for any additional sites you make from the same account.
To get the best price for manual 1-year payments, login your SimDif site on a web browser, from a phone or a computer:
There you can also take advantage of our special offer, 3 years for the price of 2.
Watch the tutorial video:
How To Pay For Smart & Pro On The Web