Not able to select the Monthly, Quarterly or Semi-Annual payment options

Hi Sir, I am able to select any of the payment options mentioned above except for the Preview option. I logged in using my username and password. Please help

We are still working on some key enhancements and we will take care of it soon.

I have $2.99 plan for first 15 days …Please help to resolve the issue as my subscription is expiring soon and have to enroll for 3/6 months package

Here are the steps for renewal process - Big Data labs - current renewal process