How do I change/upgrade my VIP All Access subscription plan?

Here's a step by step instruction on how to change or upgrade your subscription plan:

1. Go to Device Settings; 
2. iTunes & App Stores; 
3. Click on: «Apple ID: [e-mail]»; 
4. Then tap «View Apple ID»; 
5. Click on «Subscriptions»; 
6. Choose «Color Therapy»; 
7. Here you can change your subscription plan.