You can access your account/subscription information two ways:

In the app - 

1. Open My Fitness app

2. Tap on the profile icon in the upper right corner

3. Tap on Manage Subscription to see information on your current plan

On jillianmichaels.com - 

1. Login to www.jillianmichaels.com with the registration email and password. 

2. Click on the user icon

3. Select "Account"

4. Click on the arrow for further information next to each option: Account, Subscription, Billing.