There are two different duration plans introduced in Healppy SUPER, which are 1 Month(INR 99) and 12 Months(INR 999) duration.

SUPER members will get a 5% additional discount on Medicines and a 25% additional discount on Delivery Charges.

In the App, go to "My Profile Section", Tap on your "Existing Plan", it will push you to the plan details screen, 
there is one option at the bottom "Renew/Upgrade Now".

your "SUPER" membership is valid for either 1 month or 12 months from the date of purchase, depending upon the plan you have purchased

Yes, once your existing membership has expired, you will see an option to renew the membership again. However, Healppy SUPER membership prices are subject to change.