We are really sad that you want to delete your account. If there is something wrong with Stremio don't hesitate contact with us and tell about your problem. For sure we will try to solve it. But if you still want to delete your account you can do it from user panel available here - www.stremio.com
1. Login to user panel using Facebook (if you created account using facebook) or by using email
2. Scroll down till you see Delete Account option, click it.
3. Type your password and click Delete
4. In case you have Facebook login you will have to reset your password using email bounded to the Facebook account and then login to user panel using email and password you have just set
Thanks for your support hope we will see you back soon :-)